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Permatex

Permatex 84145 Plastic Welder

  • Two-part epoxy
  • 3,500 PSI strength
  • 25-minute work time
  • Gap filling
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Is the Permatex 84145 Plastic Welder worth it?

Yes, for the right buyer. The Permatex 84145 Plastic Welder ranks #3 in our Best Glue for Plastic on Plastic 2026 list (best structural). Its biggest strength: 25-minute working time allows full repositioning before it sets. The main caveat: full strength requires 24 hours.

Overview

What the Permatex 84145 Plastic Welder does well

And fills gaps up to 3mm on rough or uneven fracture surfaces. Keep in mind that full strength requires 24 hours.

Specs that matter

Key features

  • Two-part epoxy
  • 3,500 PSI strength
  • 25-minute work time
  • Gap filling
The trade-offs

Pros & cons

Pros

  • 25-minute working time allows full repositioning before it sets
  • Fills gaps up to 3mm on rough or uneven fracture surfaces
  • Sands and drills after cure for clean finishing

Cons

  • Full strength requires 24 hours
  • Mixing two parts adds steps
Fit check

Should you buy the Permatex 84145 Plastic Welder?

Buy it if you're…

  • Shopping for plastic on plastic 2026

Think twice if this matters to you

  • Full strength requires 24 hours
  • Mixing two parts adds steps
Where it ranks

Featured in 1 best-of list

ListRank
Best Glue for Plastic on Plastic 2026· Best Structural#3 / 11
Cross-shop

Alternatives to the Permatex 84145 Plastic Welder

Products ranked near it in our research, each better for a slightly different buyer.

Buying advice: adhesives

  1. Porous materials like wood, paper and fabric bond well with water-based glues. Non-porous ones like metal, glass and most plastics need epoxy, cyanoacrylate or a polyurethane adhesive. Polyethylene and polypropylene resist almost everything, so check the label lists them.
  2. Thin glues need parts that meet closely. If the joint is loose or the surfaces are uneven, epoxy or polyurethane glue fills the gap and still holds.
  3. Fast-setting glue is convenient for small fixes but leaves no time to adjust a big assembly. For furniture and glue-ups, a longer open time is worth more than speed.
  4. Standard PVA softens with moisture. For outdoor projects, cutting boards or anything washed often, look for a water-resistant (Type II) or waterproof (Type I) rating, or use epoxy.
  5. Once opened, super glue and some epoxies thicken within months. Smaller bottles that you finish quickly often work out cheaper than a big one that goes off.
Answers

Permatex 84145 Plastic Welder: common questions

Is the Permatex 84145 Plastic Welder worth buying?

Yes, for the right buyer. The Permatex 84145 Plastic Welder ranks #3 in our Best Glue for Plastic on Plastic 2026 list (best structural). Its biggest strength: 25-minute working time allows full repositioning before it sets. The main caveat: full strength requires 24 hours.

Who is the Permatex 84145 Plastic Welder best for?

Based on our research it suits plastic on plastic 2026. It's ranked #3 of 11 in our Best Glue for Plastic on Plastic 2026 list.

What are the downsides of the Permatex 84145 Plastic Welder?

The main trade-offs owners and reviewers point to: full strength requires 24 hours; mixing two parts adds steps.

What are the key features of the Permatex 84145 Plastic Welder?

Two-part epoxy, 3,500 PSI strength, 25-minute work time and Gap filling.

What are the best alternatives to the Permatex 84145 Plastic Welder?

Worth comparing: Loctite Plastics Bonding System, Gorilla Super Glue Gel and Weld-On 16 Acrylic Adhesive. Each ranks near it in our research for a slightly different buyer.

Where can I buy the Permatex 84145 Plastic Welder?

It's sold on Amazon. Prices and stock change often, so check the current listing before you buy, our link takes you straight to it.

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