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Re: Barrier Coat vs. Bottom Paint Application
If you do barrier coat, I'd recommend using Sea Hawk Tuff Stuff high-build barrier coat. We have had great luck with it. Only requires 2 or 3 coats and you can start the next coat as soon as you finish the previous one. Alternate colors so you can see where you've already coated.
If you are going to do the sanding/grinding yourself, you may want to look into a chemical stripper instead. I used Dumond's Peel Away and now I would never sand or grind bottom paint down to the gelcoat ever again (We're too cheap to pay for someone to soda blast). Breathing the toxic dust is no good. With the chemical peel, all the paint comes off in a solid strip, making cleanup easy. And the boat yard was happy that I wasn't spreading the environmental hazard all over their property and the neighboring boats. The peel material is toxic but you're not inhaling a dust and once it cures, it is pretty inert.