Hi Guys
I have run into some problems in making my first epoxy molds.
I prepared my mock up as usual and brushed on an epoxy surface coat (not Easy composites product) and let it get to the almost tack free state and then applied a second coat then let that go to the almost tack free state and then proceeded to build up the thickness. All looked good when I split the mold.
I then proceeded to apply my release system (also not Easy Composites product, but similar).
I infused an carbon part with 2 layers of twill 6k and had a perfectly sealed bag. When I demoulded the part next day I found that the fibers had pushed imprints into the surface coat as if into wax. I could wet sand them out with 1200 paper but could not buff the finish up to a high finish.
So what happened?
My first thought is that the surface coats were still soft.
If so how long do you need to wait for the epoxy to cure fully?
Your thoughts.
Fred
 
   

Hi Fred,

Could you tell us what your mould was made from, ie. surface coat and chopped strand or surface layer and woven cloth?

How long did you let the mould cure?

Was the surface layer a filled on unfilled resin system?

Kev.