Hi guys, Iv'e finished all the structural work on my '91 Skeeter and am about to start filling and sanding the imperfections on the hull before gelcoating. I'll be using poly resin and need a good mix ratio for the resin / cabosil/ glass bubble / milled fiber putty. I would like it to be easily sandable, but strong enough for the bottom of the hull below the waterline. Thanks to everyone for all your help and experience throughout this build so far.