AwlFair may be a little more expensive than the alternatives, and they might be as good, but I choose AwlFair because of how it worked in the past. In spring of 2015 I bought the quart-size (2 quarts) for a deck fairing project. It went fine - no pin holes, no sags on vertical surfaces, sands easily after overnight cure, and importantly no shrinkage (after months and years under an AwlGrip paint surface). I continued to use the same quart package for the next six years for odds-and-ends repairs. Performed exactly the same six years later when I finally scraped the bottom of the containers clean. Never clumped and never dried in the containers, in spite of the fact that the plastic cover don't seem to fit all that tight.

Used on 1970 Whaler. Easy to mix and use sands to a nice smooth finish