ASA and PSIA Instructor
Join Date: Apr 2000
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Also VC Tar barrier coat is black.
If you don't have any evidence of blisters, I would not bother with a bottom coat unless you intend to fully strip the bottom and just want to be conservative and bottom coat - figure 4-8 work days if you want to take that on. I would not bother.
Sand the existing paint until everything lose or flaky is gone, touch up any bare spots with bottom paint, roll on one coat, and get the boat in the water...
Certified...in several regards...