5.) Depending on the number of coats, they both create a "slippery" effect on the hulls. The first couple of sailings after the original application of 303, when I trapped-out, my feet felt like they were resting on ball bearings. I had almost zero traction. So now I coat the hull side where my feet rest when trapped-out, with a thinner coating and rub it in well, removing all the excess. I've only used Vertglass on canoes, kayaks, and runabouts so I don't have personal experience with how exactly how slippery it is underfoot.
Not True. I applied Vertglas to the non-skid on the deck of my monohull with no ill effects. The non-skid was not quite as grippy to bare feet as before but with proper deck shoes it was actually grippier. Vertglas is not an oil or anything like it. It's a hard coating that is more like paint than wax (but somewhere between the two) but it is thin enough to really get into the pores of the gel coat during application before it fully hardens.
