Depends on how much cloth you use when you do the repairs. If going just with the resin, then maybe two coats of resin max and lay it on THIN. If planning on adding the glass fibre, then one layer of cloth and the other of mat. One gives you strength and the other, greater ease when shaping it to the existing curves and angles. Glass and I are old frenemies. Just be careful and not end up as a latter day Big Daddie Roth and mixing batches of glass and resin by the 45 gallon barrel full at a time....................Hee, Hee, Hee, Hee.
Nick
Nick