Best Filler For Plastic Bumpers: 10 Products Compared

#1 · Best Overall

1. Carworx Flex Filler

Best for: Pinholing-conscious bumper refinishing.

Why it ranks #1: Designed for plastic bumper and body panel repair, this two-component polyester filler includes BPO hardener and is formulated to minimize micro-pinholing.

Its polyester formulation virtually eliminates micro-pinholing, helping reduce surface rework before primer and topcoat. The black-grey color also makes small scratches and irregularities easier to see, giving repairers a useful visual guide while feathering the filler across a plastic bumper or body panel.

The sandable polyester formula minimizes surface voids, supporting a smoother substrate and less correction before primer and topcoat. Its dark black-grey tone contrasts with small scratches and surface irregularities, so defects remain visible during feathering rather than being overlooked. The included BPO hardener makes this a two-component filler package. Together, those features suit repairers focused on identifying surface flaws and refining the repair before finishing; the supplied information does not specify a set or cure time.

Skip it if you need a stated working or cure time to plan the repair; those timings are not provided here.

A good fit for repairers smoothing plastic bumper and body-panel damage before primer and topcoat, especially when visible contrast helps with feathering. Keep in mind that the supplied details do not state working or cure times.

Listed on Amazon as: Flex Filler for Plastic Bumper & Body Panel Repair – Two-Component Polyester, Virtually Eliminates Micro-Pinholing, Includes BPO Hardener, 1 kg

#2 · Best for Deep Gouges

2. U-POL Stronghold 7061

• Container Type: Can

Best for: Deep gouges and road-rash repairs.

Why it ranks #2: Specifically targets bumper road rash and deep gouging, remains flexible after drying, and the 600 ml tin requires no gun, cartridge, or tip.

U-POL Stronghold 7061 is listed for fixing road rash and deep bumper gouging, making it a targeted choice for more substantial surface damage. The 600 ml tin needs no gun, cartridge, or tip, and the filler remains flexible after drying for plastic repair work.

The 600 ml tin is described as equal to at least three cartridges, while the listing says no gun, cartridge, or tip is needed. That format can simplify setup for buyers who prefer working from a tin. Its stated uses include road rash and deep bumper gouging, and it remains flexible after drying, relevant for plastic panels that flex. Reinforcement mesh is specified for hole-through and tab repairs, providing a listed approach for those particular damage types.

Skip it if you need a flexible filler specifically documented for broad flexible-plastic compatibility; Polyvance Flex Filler 2 lists flexible plastic substrates.

A fit for bumper repairs involving road rash or deep gouges, especially for buyers who want a tin rather than a cartridge setup. Use reinforcement mesh for the listed hole-through and tab repairs, and consider the damage type before choosing.

Listed on Amazon as: U-Pol Products 7061 Stronghold Body Filler for Plastic – 600ml Tin

#3 · Best for Flexible Plastics

3. Polyvance Flex Filler 2

• Compatible Material: Plastic
• Material: solid
• Container Type: Tube

Best for: Flexible OEM and aftermarket plastics.

Why it ranks #3: Its flexible epoxy filler is intended for OEM and aftermarket flexible plastic parts; the listing advises Filler Prep on TPO or PP substrates.

Polyvance Flex Filler 2 works on both OEM and aftermarket flexible plastic parts, making it a targeted choice when the repair substrate bends rather than behaving like rigid plastic. Its flexible paste comes in tubes and is listed as compatible with plastic.

The flexible epoxy filler is specified for almost any flexible plastic substrate, including OEM and aftermarket flexible parts. That compatibility makes it relevant for bumper work where the panel or component needs a flexible repair material. The paste is supplied in tubes, allowing application from a tube container rather than requiring a listed gun system. Timing depends on conditions: supplied facts state 12 hours at 78°F, or 30 minutes at 160°F, so temperature can materially shape the repair schedule.

Skip it if you need a short room-temperature turnaround; U-POL Stronghold 706 is listed as fast drying and easy sanding.

A match for repairers working on flexible OEM or aftermarket plastic parts who can accommodate temperature-dependent timing. Check substrate preparation for TPO or PP, which calls for 1060FP Filler Prep according to the supplied facts.

Listed on Amazon as: Polyvance Flex Filler 2 (Tubes)

#4

4. Eastwood Contour Flexible Filler

• Compatible Material: Plastic
• Material: Polyester
• Container Type: Bottle

Best for: Flexible automotive plastic panels.

Why it ranks #4: This 750 ml polyester putty is formulated for automotive plastics and designed to retain flexibility, with listed cure times varying by temperature.

Eastwood Contour Premium is a flexible polyester filler formulated for automotive plastics, helping a repaired area accommodate panel flex and minor impacts. Its lightweight putty is also described as easy to apply and smooth sand, pairing flexibility with a workable surface-finishing process.

The polyester formula is intended for various automotive plastics and is described as maintaining flexibility, which helps reduce the risk of cracking or breaking when a panel flexes or takes a minor impact. Its lightweight consistency and smooth-sanding description support application and surface refinement after filling. The supplied timing varies with temperature: four minutes at 86°F, five minutes at 68°F, and eight minutes at 50°F. That variation makes the surrounding temperature relevant when planning application and finishing.

Skip it if you need a long application window; its listed set times are four to eight minutes, depending on temperature.

A fit for automotive plastic repairs where flexibility and a smooth-sanding putty matter. Its listed set times are brief and temperature-dependent, so account for ambient conditions and work promptly during application.

Listed on Amazon as: Eastwood Contour Premium Automotive Flexible Body Filler | Lightweight Polyester Fillers for Car Plastic Parts and Trims | Easy to Apply and Smooth Sanding Flexible Putty for Car Repairs | 750ml

#5 · Best for Spot Filling

5. Evercoat Poly-Flex

• Compatible Material: Fiberglass, Metal, Plastic
• Material: Resin
• Container Type: Bottle

Best for: Flexible bumper skim coating.

Why it ranks #5: Flexible polyester glazing putty is designed for spot filling and skim coating flexible bumpers, including minor sand scratches, nicks, dings, and gouges.

Evercoat Poly-Flex is a flexible polyester glazing putty for spot filling and skim coating flexible bumpers and plastic parts. Its flowable viscosity targets minor flaws such as sand scratches, nicks, dings, and gouges, making it a focused finishing product rather than a general deep-rebuild filler.

The flowable cream is intended for minor imperfections, so it can address surface scratches, nicks, dings, and gouges across a repair area. Its flexible formulation suits flexible bumpers and plastic parts, while the listed compatibility also includes fiberglass and metal. The product is described as easy to sand with 180-grit sandpaper, giving buyers a specific abrasive reference for refining the filled surface. This combination supports spot filling and skim coating where a flexible finish and controlled surface cleanup matter.

Skip it if you need to rebuild deep bumper damage; U-POL Stronghold 7061 is listed for deep gouging and road rash.

Choose it for flexible bumper spot repairs and skim coating over minor flaws, especially when 180-grit sanding guidance is useful. It is not the listed choice for deep gouging or structural rebuilding.

Listed on Amazon as: Evercoat Poly-Flex Flexible Polyester Glazing Putty for Spot Filling and Skim Coating – 30 Fl Oz

#6

6. U-POL Stronghold 706

• Compatible Material: Plastic, Rubber
• Material: Polyester, Polyurethane
• Container Type: Can

Best for: Fast-sanding bumper surface repairs.

Why it ranks #6: The 600 ml polyester filler is described for bumpers and most plastics, with fast drying, easy sanding, and a pinhole-free finish.

U-POL Stronghold 706 is a pinhole-free, fast-drying polyester filler for bumpers, SMC, and most plastics. Its stated use includes filling scratches and scuffs or finishing a repaired area, giving buyers a surface-repair option for more than one stage of bumper refinishing.

The pinhole-free polyester formula is described as fast drying and easy sanding, helping repairers move from filling surface defects toward refinement without an unnecessarily complex sequence. Its listed 600 ml quantity suits buyers planning more than a very small spot repair. Compatibility includes bumpers, SMC, and most plastics; additional details also name steel, aluminium, and GRP as substrates. A flexible option is noted for flexible plastics, polyurethane foams, and rubber, so buyers should distinguish that option from the standard product when substrate flexibility matters.

Skip it if you need an explicitly flexible filler for a flexible bumper; Polyvance Flex Filler 2 is specified for flexible plastic parts.

Consider it for surface defects on bumpers, SMC, or listed rigid substrates when fast drying and sanding matter. For flexible plastics, confirm that the flexible option is the one being selected rather than assuming the standard filler has that property.

Listed on Amazon as: U-Pol Stronghold 706 Smooth Hig Adhesion Body Filler for Plastics

#7

7. Roberlo Multiplast

• Compatible Material: Metal, Plastic
• Material: Plastic
• Container Type: Tube

Best for: Lightweight plastic-and-metal repairs.

Why it ranks #7: This lightweight filler includes hardener and is listed for plastic and metal, but its supplied details do not establish flexible-plastic suitability.

Roberlo Multiplast combines a lightweight filler with included hardener, giving repairers a complete package for plastic or metal surface work. The lightweight formula is described as easy to apply and sand, helping make spreading and finishing more manageable across dents, scratches, and other imperfections.

Its lightweight paste is described as easy to spread, which can make application less tiring during surface repairs. The supplied description also identifies easier sanding and a smooth finish, helping move the repaired area toward finishing work. Because the listed compatible materials include both plastic and metal, one product can serve different vehicle repair substrates. Original Roberlo hardener is included for curing, so buyers receive the specified companion component with the filler rather than sourcing it separately.

Skip it if you need a stated cure schedule before starting; this listing provides no specific set or cure time.

A useful fit for repairers seeking a lightweight filler for plastic and metal dents or scratches, with hardener supplied. Buyers who need tightly scheduled work should note that no specific set or cure timing is listed.

Listed on Amazon as: Roberlo Multiplast Lightweight Body Filler + Hardener | Professional Auto Body Repair Kit for Plastic & Metal | Fast Drying, Easy Sanding, Smooth Finish

#8

8. Roberlo Maxifill

• Material: Aluminum, Steel

Best for: Lightweight multi-substrate body filling.

Why it ranks #8: The one-liter product includes hardener and is described as paintable and compatible with plastic, but the listing gives no specific bumper-flexibility details.

Roberlo Maxifill pairs a one-liter quantity with included hardener, making it a substantial option for buyers handling broader repair work. Its listing describes lightweight, easy-sanding, paintable filler that adheres to fiberglass, metal, plastic, and other surfaces for dents and scratches.

The one-liter size gives repairers a larger quantity for working across dents and scratches than a small spot-filling package. The product is described as lightweight and easy sanding, which can make spreading and shaping the filler more manageable before paint. Its listed adhesion spans fiberglass, metal, and plastic, allowing use across different repair substrates. Included hardener completes the stated package, while the paintable description supports moving from the filled and sanded surface toward a paint finish.

Skip it if you need a specified working or curing schedule; Roberlo Multiplast also has no stated timing in its supplied details.

A sensible match for buyers needing a larger quantity of lightweight, paintable filler across plastic and other listed substrates. Its details omit set and cure times, so it offers less scheduling guidance than a product with stated timing.

Listed on Amazon as: Roberlo Maxifill Superior Lightweight Body Filler – Easy Sanding, Lightweight & Paintable for Car Repairs – Adheres to Fiberglass, Metal, Plastic & More – Ideal for Dents & Scratches -1 Liter+Hardener

#9

9. J-B Weld PlasticBonder

• Compatible Material: Cement
• Material: Resin
• Container Type: Syringe

Best for: Quick-set adhesive gap repairs.

Why it ranks #9: A two-part urethane adhesive and gap filler works on thermoplastics and sets in 15 minutes, but it is not presented as a broad skim filler.

A 1:1 mixing ratio and 15-minute set time make J-B Weld PlasticBonder a practical choice when a plastic repair needs a defined quick-setting workflow. This two-part urethane adhesive also works across thermoplastics, thermoset materials, carbon-fiber composites, and coated metals.

The syringe dispenses the two parts at a 1:1 ratio, giving buyers a straightforward mixing arrangement for repair work. Its stated 15-minute set time offers a clear near-term milestone, and the adhesive can be sanded after 30 minutes, supporting a move toward surface finishing. The formula is listed for thermoplastics, thermoset materials, carbon-fiber composites, coated metals, concrete, and more, so it can serve beyond bumper plastics. The 25 ml syringe is resealable to help prevent air from curing the remaining product.

Skip it if you need a large quantity for broad-area filling; choose a larger-format option such as U-POL Stronghold 7061.

A fit for buyers making smaller plastic bonding or gap-filling repairs who value a timed set and sanding schedule. Its 25 ml syringe suits limited applications better than extensive bumper coverage, and the material requires mixing.

Listed on Amazon as: J-B Weld 50139 Plastic Bonder Body Panel Adhesive and Gap Filler Syringe – Black – 25 ml

#10

10. J-B Weld PlasticWeld

• Compatible Material: Plastic
• Material: Epoxy Putty
• Container Type: Cartridge

Best for: Hand-mixed plastic repair putty.

Why it ranks #10: This hand-mixable epoxy putty can repair auto bumpers and rebuild plastic, but its listing does not specify flexible-bumper compatibility.

Hand-kneading the two-part PlasticWeld putty lets buyers mold or build up material directly on a plastic repair. Its listed uses include ABS, PVC, CPVC, and auto bumpers, making it a versatile option when the repair calls for a shaped putty rather than a liquid adhesive.

The hand-mixable epoxy putty becomes a moldable polymer compound after kneading, which supports rebuilding as well as repairing plastic surfaces. Its listed compatibility with ABS, PVC, and CPVC pipes and plastics, plus auto bumpers, gives it several defined repair applications. The product sets in 25 minutes, providing a stated interval after mixing. NSF certification and suitability for potable-water contact are additional listed attributes, though bumper buyers may chiefly value the ability to shape the putty to the repair area.

Skip it if you prefer a ready-to-dispense syringe instead of hand-kneading; J-B Weld PlasticBonder uses a dispensing syringe.

Choose it for DIY repairs that need moldable material to rebuild plastic, including listed bumper applications. It is less suited to anyone avoiding hand-mixing, and its 25-minute set time should be part of the repair workflow.

Listed on Amazon as: J-B Weld 8237 PlasticWeld Plastic Repair Epoxy Putty – 2 oz.