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Mold Making & Casting Class
I've found if I thin the poly. and wipe it on, a thin coat at the time I eliminate the bubbles almost completely.
Something that helps (if you've got room to carry it) I roll up newspaper, about six inches long and 1 inch diameter and dip it into a pan of melted canning wax which is easily available. Once lit it'll burn for 5 or ten minutes and helps very much in getting the fire going.
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