From my point of view, there are four caveats.

1. Be extremely careful in weighing the components so that the mix is as 
stoichiometric as possible.
2. Make sure that mixing introduces no air bubbles
3. Make sure your assembly is defluxed and as clean as possible before 
pouring in the mix
4. Make sure your mix displaces all air from under your components or 
use a vacuum to evacuate it.

Brian

Colin Weber wrote:
> Hello,
> 
> I wish to pot a small automotive module for which I am assembling very 
> small volume.
> I used what was on hand, a fibreglass polyester resin, for my first 
> prototype without
> incident.
> 
> Can anybody comment on the appropriateness of continuing to use such 
> resin as while
> this is somewhat of a backyard exercise for some ignition modules, for 
> which I found the
> resin readily available and cheap, I am keen to pursue reliability. I 
> have no knowledge of
> whether such a resin has any negative influence on electronic 
> components, FR4 board
> and PVC wires. The alternative Dow corning materials seem rather expensive.
> 
> Cheers, Colin
> 
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