I'm in the process of filling the weave of the fiberglass on my first kayak and was wondering if there are any tricks (other than sanding) to getting a fine finish for applying paint. I build ship and boat models and have used high build primer for this purpose. I've read that the talc in the high build primer causes problems with hulls that can get wet. Any recommendations for a primer or other material that works well?
Also, can you use automotive putty (or other fast dry easy sand substace) for filling defects under paint or does it have to be thickened epoxy?