pastisol

I use crystal clear from do-it. When I us 1/4 or 1/2 of the box I start getting tiny bubbles in it. Does anyone know what I can do to stop this. I have tried heating it way up but still has them. I tried heat it slower mixing it several times. I always shake the box for about a minute or so before I hear it. I have thought about putting it in a bottle and shake the fire out of it but not tried it yet. Any help would be appreciated

Small bubbles are a humidity issue. I'd store the box of plastic in a room that is being dehumidifier constantly...laundry or furnace room maybe.

Thanks CTom, that make sense cause I do live in a under house.