Yes you will need to use a sanding block. The perfection will go on extremly thin. You will need to get the brushing thinner for it as well. The primer is a high solids coating - meaning it goes on at a high dry film thickness and does not have much solvent to evaporate. However the perfection should go on as thin as you can get it without running. Youre probably looking at 3-4 coats. It will go a long way. Download the applicators manual online, it will tell you the recommended thinning percentages etc... i would highly highly recommend painting something to practice first with the entire system. Small piece of plexi with the primer and the 3 top coats. as for the orbital sander... you may have made a slight mistake as you will be able to see the places where the edge dug in especially up in that big carolina flare portion of the boat. I found this out the hard way.
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