Talk Composites - The Forum for Advanced Composites

Mould repair - Cleaning out non setting gelcoat/wax additive

http://www.talkcomposites.com/Topic19220.aspx

By Lenny - 9/16/2015 1:19:26 PM

I tried repairing my mould last night as there were a few pin holes in the surface.

I therefore mixed up some tooling gelocat and wax additive and just filled in the holes.

Its now almost 24 hours since and the repair areas are still a little tacky.

I did use the correct ratio, but obviously something hasn't gone to process.

Therefore, what is the best solution to fix this ?

Do I wipe away the existing tacky repair and try and fill them again, or is there anything you can do to harden the existing repairs ?
By MarkMK - 9/17/2015 1:10:32 PM

Another method, that could also save you having to mix in the wax additive, is to create sticking plasters from flash or brown packing tape. By sticking a small square onto a larger piece of tape (so that the none sticky section covers the new gelcoat) you can seal-off the repair, which should allow full cure (as long as the catalyst is mixed appropriately).

If done carefully, you can also end up with repair sections that are just proud of the mould surface which should save time on flatting back also