Here’s my situation. I have a mold that was made using Polyester tool gel coat backed with about 1/8" of Polyester Resin and chop strand fiberglass. I will admit that there are a few spots of Bondo on the surface where I had to fix the mold but this doesn’t appear to be the actual issue. I coated the surface of the mold with 5 good coats of Mirro Glaze wax and a good dose of Frekote (though it escapes me at the moment which specific Frekote product it is, 44 or 770, I believe 44).
I used a bit of spray glue that was recommended on this form to tack some corners of the first ply into the mold because I had some pretty serious bridging issues in those areas before (still a bit, but not nearly as bad this time thanks to a new mold design, so at least I’m learning something!)
I am working with a Vinylester Resin and carbon fiber cloths to make a part using vacuum infusion. After running a “test part” and finding a few problems with my mold, mostly a small bit of bridging here and there and two leak paths in the mold design which I need to seal with Polyester resin and fiberglass. After removing the part though, litt bits of the Vinylester resin appears to have bonded to the surface of the mold. It is mostly on the high spots of the weave where the resin thickness would be the smallest it could be.
Is it possible that the Frekote is actually removing the wax? Should I apply the Frekote then the wax? Is the spray glue possibly causing this? If I applied a thin coat of a urethane based clear coat automotive paint to the mold before wax/release would that help?
I appreciate any help anyone can offer. If I can’t solve this, I’ll be switching back to epoxy resins. I’ve never had this issue with the epoxy I’ve used but it’ll mean I have to go back to a wet/hand layup instead of infusion, which I don’t really want to do.