Polyesters get hot whilst curing and in castings are built up to save the
thing cracking or in extreme cases self igniting, er ,guess who put too much
catalyst in ;-) Polys are not, without additives , very flexible and also
shrink by up to 3 or 4 % .
Heat also finds every dry joint in your board ...
I think that using less catalyst will help avoid the heat problem. It will
take longer to cure, but end result will be the same. Atleast that is my
limited experience from messing up the resin/catalyst ratio when making
fiberglass parts with polyester.
I'm concerned about effects from the resin being hard as most potting
compounds are flexible. Will this be a problem?
I was also concerned about chemical compatibility, ie. the resin disolving
plastics used in IC packages or other components, but I guess this can not
be a problem since you have used polyester.
Any long term problems?
Anyone else who has tried polyester resin for potting?