Talk Composites - The Forum for Advanced Composites

help cracks in mould

http://www.talkcomposites.com/Topic491.aspx

By Daz - 2/2/2012 6:18:19 PM

what do i do with cracks in my mould

I think its because i had to be a bit aggressive getting the mould of the roof

There are also some very fine cracks which the camera wouldnt pick up

How do i fix them as it was an expensive mould and i dont want to scrap it Sad
By CarbonMike - 12/27/2012 10:08:42 PM

fgayford (11/12/2012)
I believe your cracks are the result of having your gelcoat too thick, any bending of the mold will crack thick gelcoat.

The best way to fix it is to V out the whole crack and then mix up some of the same gelcoat you used and build it up layer by layer. If you get gravity

on your side fill the crack just barely and put a tightly stretched piece of clear packaging tape down over it. It will flatten things down quite well. Once cured you will have to carefully bd sand the repair down flat and polish. I use 2 or 3 inch pieces of paint sticks.

Another thought. You will wax the mold on your next part anyway so wax will seal the crack. Your part will have a slight crown which is easy to sand down.

Fred


As already here really. Although its also very easy to repair really minor cracks in moulds using super glue. The same why you can secretly repair repair carbon with basically.