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So we had 30 yrs of bottom paint blasted off. Wow is all i can say. Even I feel lighter. Now the prep before barrier coat. Should I use automotive bondo to fill the small voids and imperfections? Also how many coats (roughly) should I expect from a gallon of barrier coat for a 30' boat with fin keel? I won't hold you to it. Just need a starting point.
J
3M makes a very good filler for this purpose and it is easier to work with then epoxy. It is called Premium Filler.
The barrier coat you are using will have info on how much it covers. I used Interprotect 2000, alternating between grey and white coats so it was easy to see your coverage. About two coats per gallon I think but it was a few years ago.
After soda blasting I lightly sanded the hull, refinished the keel, touched up the hull, barrier coated with Pettit Protect, and then ablative bottom paint.
I used Quick Fair from System Three. It was easy to apply and sand.
On my 35' boat I got about 1 coat from a gallon on Pettit protect.
Bondo: Only if you're a u-boat commander as in the movie "Risky Business".
You're going to a lot of time and trouble to strip the boat down and "do it once do it right". Right?
So look at the MANUFACTURERS" INSTRUCTIONS on the product(s) you want to use. Starting with the barrier coat, see what they say is the best filler/primer, see what tey say are compatible products under and over it, see what they say the coverage rate is when it is applied at the correct thickness. Too thin is no good, too thick is no good.
Maybe you can save a buck by cheaping out on materials, but if you want the product to perform AS WARRANTEED, you stick to the whole list of compatible and correct products that the maker says will do the job.
Don't get pennywise on a job like this.
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