Cloth Types

Is there somewhere that describes what the difference is and when to use cloth vs roving vs mat vs ??? Also... what type of fiber to use. I was thinking about using Isophthalic High-Strength Resin becuase I need something FDA approved for what I'm doing.

[Not A Guest]

Small projects usually use woven cloth, larger projects use alternating layers of roving (or heavy cloth) and mat.

FDA approval is more concerned with the resin and the finish - the cloths are mostly inert.

Originally Posted by Not A Guest

Small projects usually use woven cloth, larger projects use alternating layers of roving (or heavy cloth) and mat.

FDA approval is more concerned with the resin and the finish - the cloths are mostly inert.

I am making some liners for tanks that will hold water... about 70 gallons. Would 1.5oz chopped mat be a good choice for this?

Also I will be using CDX plywood for the mold. Do I need to seal it so the resin does not get absorbed by the plywood?