Plastic Repair Epoxy Putty: What to Use in the Garage
Plastic repair epoxy putty fills cracks in bumpers, trim and pipes: how to knead, shape and finish it, and which sticks suit common garage repairs.
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Top picks at a glance
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- 1
Epoxy Putty - 10oz Fast Repair Multipurpose Clay9.7/10View on Amazon - 2
J-B Weld 8237 PlasticWeld Plastic Repair Epoxy9.6/10View on Amazon - 3
STARBOND 2 oz. White Epoxy Putty Stick9.6/10View on Amazon - 4
Loctite Epoxy Multi Purpose Repair Putty9.6/10View on Amazon
A cracked bumper tab and a pinhole in a plastic water tank all point to the same fix. Plastic repair epoxy putty is a hand-mixable two-part stick that is kneaded, pressed into the break and shaped while soft, then left to set hard enough to sand, drill and paint. It suits rigid and semi-flexible plastic in the garage, from ABS and PVC to bumpers, trim and vinyl.
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Below: what the putty handles, how to knead and shape it, set times and heat ranges, and answers to common garage questions.
Epoxy Putty - 10oz Fast Repair Multipurpose Clay
A 10 oz two-part epoxy putty with a scraper that hardens in 8 minutes, sets in 30 minutes and bonds metal, plastic, stone, wood, ceramic, acrylic and glass.
Pros
- 280g of putty with a scraper in the box
- Hardens in 8 minutes and sets in 30 minutes
- Withstands -50C to 130C
- Bonds metal, plastic, stone, wood, ceramic, acrylic and glass
Cons
- 90 day warranty is short
- Hardens in 8 minutes, so shaping time is short
- White finish may need paint to blend with dark trim
- 10 oz size may be more putty than a small repair needs
J-B Weld 8237 PlasticWeld Plastic Repair Epoxy
A hand-mixable two-part epoxy putty stick for ABS, PVC and CPVC, auto bumpers and trim, with 600 PSI lap shear strength.
Pros
- 600 PSI lap shear strength
- Sets in 25 minutes and is fully hard in 3 hours
- Withstands 250F continuous and 300F intermittent use
- NSF certified and safe for contact with potable water
Cons
- No warranty term is stated
- 2 oz stick suits small repairs only
- Off-white finish may need paint to blend with dark trim
- 25 minute set time is slower than the faster sticks here
STARBOND 2 oz. White Epoxy Putty Stick
A white two-part epoxy putty stick that hardens rock-hard across a -20F to 392F range for automotive, plumbing, woodworking and DIY repairs.
Pros
- Hardens rock-hard and allows sanding, shaping and painting
- Temperature range of -20F to 392F
- Bonds metal, plastic, wood and ceramic
- BPA-free, low-odor formula
Cons
- 2 oz stick suits small repairs only
- White finish may need paint to blend with dark trim
- No scraper or shaping tool comes with the stick
- Hardens rock-hard, so shaping must happen before it sets
Loctite Epoxy Multi Purpose Repair Putty
A hand-mixable two-part epoxy putty stick that bonds damp surfaces and hardens underwater, ready to sand, drill and paint after 60 minutes.
Pros
- Bonds to damp surfaces and hardens underwater
- Ready to sand, drill and paint after 60 minutes
- Waterproof bond, resistant to water and most common solvents
- Bonds metal, masonry, brick, wood, glass, ceramic, rubber and fiberglass composite
Cons
- No warranty term is stated
- 3 to 5 minute working time leaves little room for large fills
- Light blue color may show on dark trim until painted
- 2 oz stick suits small repairs only
What plastic repair epoxy putty does
The sticks in this guide bond plastic, and most also bond metal, wood and ceramic; Loctite and Limino also bond glass, so a single stick can cover bumper trim and a pipe fitting. J-B Weld lists ABS, PVC and CPVC, auto bumpers and trim, vinyl siding, marine repairs and fiberglass parts. A putty repair is a fill and a bond, not a melt: it rebuilds missing shape and seals a crack, while a welder melts the plastic itself.
How to use plastic repair epoxy putty in the garage
- Clean the break so the putty has something to grip.
- Knead equal parts by hand until the color is uniform.
- Press the putty into the crack or hole and shape it while it is still soft.
- Leave it alone until it sets hard, then sand, drill or paint the repair.
- Check the maker instructions before sanding or loading the part.
Putty fills and bonds a break; it does not fuse plastic the way heat does. For a tear that needs melting back together, see the plastic repair welder kit guide.
Read the manual before first use, wear eye protection, keep the work area clear and ventilated, and stay within every stated rating. Read our Safety Disclaimer.
Set times and heat ranges at a glance
| Putty | Set time | Fully hard | Heat range |
|---|---|---|---|
| J-B Weld PlasticWeld | 25 minutes | 3 hours | Up to 250F continuous, 300F intermittent |
| STARBOND Epoxy Putty | Not stated | Not stated | -20F to 392F |
| Loctite Repair Putty | 3 to 5 minutes working time | 24 hours | Not stated |
| Limino Epoxy Putty | 30 minutes | 24 hours | -50C to 130C |
Plastic repair epoxy putty picks for the garage
Each stick below handles a different part of the job, from a bumper-tab fix to a large fill.
Plastic repair epoxy putty vs body filler
Body filler spreads thin over a wide panel, while epoxy putty kneads into a crack or hole and rebuilds missing shape. For a missing bumper tab, putty holds shape where filler would sag. Compare the two in the guide to epoxy putty vs body filler, and see how putty compares with a branded epoxy in epoxy putty vs JB Weld.
FAQ: garage tools
Can plastic repair epoxy putty fix a cracked car bumper?
Yes, for a clean crack or broken tab. J-B Weld lists auto bumpers and trim, and STARBOND lists automotive repairs. Knead it, press it into the break, shape it while soft and leave it to set.
How long does plastic repair epoxy putty take to set?
It depends on the stick. J-B Weld sets in 25 minutes and is fully hard in 3 hours. Limino sets in 30 minutes and is fully hard in 24 hours. Loctite gives 3 to 5 minutes of working time and lists 24 hours to full hardness, with sanding, drilling and painting after 60 minutes. STARBOND states no set time.
Can epoxy putty be sanded, drilled and painted?
Yes. J-B Weld can be molded, shaped, sanded, drilled and cut. Loctite can be sanded, drilled and painted after 60 minutes. Limino allows drilling, grinding and painting, and STARBOND allows sanding, shaping and painting.
Does epoxy putty work on damp surfaces?
Loctite bonds to damp surfaces and hardens underwater, which suits a leak patch on a pipe or tank. Limino is also listed for repairs underwater and above. For the other sticks, dry the surface and follow the maker instructions.
What plastics can epoxy putty repair?
J-B Weld lists ABS, PVC and CPVC, vinyl siding, marine repairs and fiberglass parts. Check the stick against the plastic in hand.
Can epoxy putty handle heat?
STARBOND lists -20F to 392F. J-B Weld lists continuous use up to 250F and intermittent use up to 300F. Limino lists -50C to 130C. Match the range to the part.
Related: epoxy putty vs body filler, the best plastic stapler welder and epoxy garage floor repair.
