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MySubie Mafia
Location: Lexington, NC
1999 Subaru
Legacy GT

What can I use to keep fiberglass from sticking to the part I'm molding it over???

Need to find out what I can use so I can get a cast of the parts Im custom molding with fiberglass to not stick to the original OEM parts from the car. Any suggestions?

asked in Interior and Exterior / Misc about a 2000 Impreza 2.5RS at 01:37am on Mar 18, 2010. viewed 15677 times

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Answers (6)

Painter tape and you can get it pretty much anywhere, Wal-Mart, Target, Home Depot, Lowe's, etc... I believe it's usuially blue in color and it's not a sticky as masking tape so it will remove easily. Tape it to the surface you want to protect, then apply resin. After it dries, you should be able to remove the hardened fiberglass and pull the tape off of it. I also, suggest using at least two or more layers of the tape to prevent possible leaking of the resin in between the strips of tape. GL!

04:32am on Jun 20, 2010

Best Answer - chosen by Asker

MySubie Mafia
Location: Claremont, NH
1997 Subaru
Impreza L 2.2 SOHC
petroleum jelly

09:37am on Mar 18, 2010

The answer to this question depends on a number of factors but the bottom line is this: if you do not want a part to stick to and possibly ruin your mold, then use PVA over a wax mold release. If the mold is new or reconditioned, then you should definitely use a PVA such as Partall® Coverall Film or Partall® Film #10 to prevent styrene migration. If the mold is seasoned, then use of PVA is not absolutely necessary except as additional insurance against sticking as long as wax is applied properl

09:43am on Mar 18, 2010

youtube has some vids on fiberglassing mybe one of them will tell you good luck

10:21am on Mar 20, 2010

There are fiberglass release solutions that you can buy if you're planning on painting your mold. I don't recommend using petroleum jelly because it's hard to clean before paint/primer prep.

08:06pm on Mar 23, 2010

I have seen people use aluminum foil to make sure the fiberglass doesn't stick to the piece.

11:46pm on Mar 23, 2010