Fixing cracked plastic

Discussion in 'Chainsaw' started by Huskybill, Apr 15, 2019.

  1. Huskybill

    Huskybill Addicted to ArboristSite

    May 21, 2018
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    I have a 2100 carb cover that’s cracked in both corners, I picked up some devcon plastic weld two part epoxy. I cleaned the area to be epoxyed. I applied the epoxy and it held good. Then I was thinking about reinforcing the inside of the crack with webbing. I found good strong plastic webbing that’s used for drainage on Bonzi plants. It’s bendable, playable and I sanded the inside of the crack applied fresh epoxy. I put the webbing into the epoxy. Now once that hardened I applied another coat of epoxy over the webbing. It’s like doing cement work with plastics. Then I did a little fitting with the drum sander on the Dremel to fit the pre cleaner screen.
    95custmz likes this.
  2. lil171

    lil171 ArboristSite Operative

    Oct 2, 2018
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    The only other thing I would have done is 'flash' the plastic quickly with a small torch or lighter before applying the epoxy. It is just to make sure all contaminents are gone, as well as some plastics require it before repairing. This is from a working on plastics for a living in a bodyshop. If your repair works, good for you, and if not, you may want to try the method below.

    To flame treat a plastic surface, hold a propane torch flame about 4" to 6" from the plastic (with the tip of the flame just above the surface) and move it across the surface at a rate of 2 or 3 inches per second overlapping the previous pass slightly. Keep the torch moving and only allow the exhaust gases to hit the surface. If done correctly, the surface will not discolor or burn in any obvious way. This technique oxidizes the surface and improves adhesion. For best adhesion, bond to the surface within 30 minutes of treatment.
    TheTone and 95custmz like this.

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