Thursday, April 19, 2012
Editors note/update: Don't roll sprayable fairing compound. I always forget exactly how much sanding it takes to get the roller stipple to go away. Added about 3 hours of sanding. I ended up using 60 grit hookit on a 5 inch random orbit sander, and 40 grit on a 16 1/2 inch long board, and 80 on a 3M flexible Marine fairing board to get it blocked down.
I borrowed a set of hands to wrap a wooden batten around the hull to address whether or not my question mark areas were high spots or the edge of low spots, marked them and will spray her with another coat or three of fairing compound. She has an 1/8th inch low from the stem to where she starts her turn, just aft the chain locker bulkkhead. There is another low about where the forward large portlights are where the hull goes from round to flat that needs a bit of love.
Those holes will get an extra pass for each coat sprayed. The whole boat needs to be build out a bit more than a 1/16th to get past the high ridges left by the old bulkheads and stringers that telegraph through with each sanding. The goal is to stop sanding when you see the previous coat start to show its self, add another coat and average out the surface. When you hit harder paint, or fiberglass through soft primer it makes a halo, the high spot never gets lower, but digs a low spot all the way around the high.
Until the whole panel is one color, its very hard to get the last of the ripples out.