I just noticed your pigment bottles say “polyester/polyurethane” on them. Are they also suitable for your clear cast epoxy?

Yes our Translucent Tinting Pigments are compatible with epoxies as well no problem. 


Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

Thanks Warren...in which case, part two of question :-).

I mixed some glasscast for the first time on Sunday...fresh tin;, never opened, only a month or two since ordered.

I made up 60g, so 40g resin, 20g hardener. Few drops or your red translucent pigment. Stirred it well by hand, cast it into a silicone mould made two days before.

How hard should the product be after two days? It still has a distinct “taffyish” feel...it’s only a 100x100 square by 4mm deep.

Thanks!

Depends on the curing temperature but it should be hard.  If it has a tacky finish then that would suggest it was not accurately measured out or mixed enough.  Small batches of any resin can be problematic as for epoxies to cure properly you need ideally to be within a couple of % accuracy which is a challenge for many scales.  Also at that size, the waste on the side of the cup and the corner in the bottom of the cup can be proportionality enough to screw up the overall mix ratio and hence despite best efforts you can end up with a mix that doesn't cure properly.  We tend to recommend that using a bigger batch, eg 100g or more then accepting a bit of waste is the better solution as you are more likely to get a good cure.

You might be able to salvage it by putting the mould somewhere nice and hot like on top of a radiator or in an airing cupboard for a few hours as the heat may be enough to finish it off.


Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant