Ah, yes you could layer it. . .I forgot you said it was a bathtub. . .manufacturer? The woven cloth is not as bad as the spray by a long shot. I made a duplicate of my current front bumper in case it exploded too.
Although the current bumper is easily 2-3 times stronger. The weave gives the material MUCH more strength than spray but it takes more time than spraying it and heating. With most resins out there you don't have to heat it or vacuum pump, but if you want you can get pre-impregnated for the ultimate in strength-density.
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