could use some interprotect advice regarding filling voids/cracks with watertitie.

[albergsailor]

well im going with the interprotect due to time/money contstraints. Like i said my gelcoat is screwed all the hairline cracks are much larger due to the sandblasting, a ton of blister voids, and i blasted down to fiberglass in many spots. Is it as easy and just smearing the interlux watertight epoxy compound filler into all these voids(like bondo), then sanding them smooth. then proceeding with the 2000? Thanks evryone