[jclark003]

I use Awlgrip for thru hulls that sit above the bottom paint. provides a high quality finish near color matched to the hull sides and boot stripe. Scuff them with a scotchbrite pad, then self-etching primer (for metal fittings) followed by topcoat. Regular Awlgrip can be brushed (using proper converter and reducer) or sprayed. It will stick to plastic as long as you get the shine off the plastic. I use a 260 grit wet paper and have had good results.

Good luck