Talk Composites - The Forum for Advanced Composites

CNC cut foam to make a mold

http://www.talkcomposites.com/Topic31174.aspx

By Joel Illerhag - 12/2/2018 10:40:12 PM


Hi!
I will CNC cut a plug from Polystyrene foam and will buy the Easycomposites  "Uni-Mould Complete Mould Making Kit "
My question is:
How can I get a smooth surface at the finished foam-plug before I put gelcoat on?
Is there some kind of product that would be suitable for this?


The plug is 1800 mm long and 600 mm wide.

Have a great day!
Regards.
Joel
By Joel Illerhag - 12/3/2018 10:05:22 AM

Thanks Fasta,
A very good advice about not using dens epoxy. It would be a nightmare to sand down.

I will definatly go for "epoxy faring pastes". I found this at easycomposites: 
https://www.easycomposites.co.uk/emp60-epoxy-moulding-paste

And I will go and see what kind of foams they have in the local shop. PVC or urethane foam sound like a good alternative to the standard white 
polystyrene


Thanks a lot!