From the attached photos, you can see that the barrier coat and bottom paint are failing at the waterline.
I purchased the boat in 2001. The boat is in the water year-round in Puget Sound (50 degrees F). At purchase my local yard painted the bottom with Interlux Fiberglass Bottomkote (hard epoxy). I recoated with same every 12 to 18 months until 2011.
At every haulout, large patches of paint would crack and peel off. The exposed hull did not look like shiny white gelcoat, like my topsides, but looked like redish rough glass as you can see in the attached photos. I didn't know much about hulls and fiberglass then, so I would scrape as much as I could get off, fare the edges, and recoat. Never had any blisters or other problems.
In August 2011 at haulout, the bottom was looking like craters of the moon, so I decided to go for it and remove the many years of hard bottom paint, and apply a barrier coat, after consulting with Hunter. Power vacuum sanded with 80 grit, wiped with Interlux 202 dewaxer, applied 4 coats of GRAY Interprotect 2000E per instructions, and applied 3 coats of Blue Water Coppershield CSX, first red indicator coat, then two coats blue.
At one year (June), after a haul and powerwash, it looked great, so just changed zincs and splashed.
Late last summer I notice that all finishes were failing at the waterline. These photos were taken in September. It has slowly progress in the same way. The Interprotect is failing at the waterline. My diver, who was fixing the prop today, says the rest of the hull looks fine, other than it is time to paint.
I showed these photos to my service manager (who always gives me great advice, and will bail me out when I get in over my head), and he was stumped. He was surprised to learn that I had never seen white gelcoat under my bottom paint. Did some dealers remove it in the 1990s? He also had never seen Interprotect fail like that. He wondered if it could be moisture trying to escape, but it was two weeks of very warm weather when I sanded the hull. Could the glass still be gassing? After 22 years? Some other contaminate? He strongly suggested I contact Hunter, so I am.
Interlux had no answers, they just said to spot sand, build up the patches with Interprotect, and repaint.
Any thoughts? You guys are always great at helping me solve such mysteries.
Thanks.
I purchased the boat in 2001. The boat is in the water year-round in Puget Sound (50 degrees F). At purchase my local yard painted the bottom with Interlux Fiberglass Bottomkote (hard epoxy). I recoated with same every 12 to 18 months until 2011.
At every haulout, large patches of paint would crack and peel off. The exposed hull did not look like shiny white gelcoat, like my topsides, but looked like redish rough glass as you can see in the attached photos. I didn't know much about hulls and fiberglass then, so I would scrape as much as I could get off, fare the edges, and recoat. Never had any blisters or other problems.
In August 2011 at haulout, the bottom was looking like craters of the moon, so I decided to go for it and remove the many years of hard bottom paint, and apply a barrier coat, after consulting with Hunter. Power vacuum sanded with 80 grit, wiped with Interlux 202 dewaxer, applied 4 coats of GRAY Interprotect 2000E per instructions, and applied 3 coats of Blue Water Coppershield CSX, first red indicator coat, then two coats blue.
At one year (June), after a haul and powerwash, it looked great, so just changed zincs and splashed.
Late last summer I notice that all finishes were failing at the waterline. These photos were taken in September. It has slowly progress in the same way. The Interprotect is failing at the waterline. My diver, who was fixing the prop today, says the rest of the hull looks fine, other than it is time to paint.
I showed these photos to my service manager (who always gives me great advice, and will bail me out when I get in over my head), and he was stumped. He was surprised to learn that I had never seen white gelcoat under my bottom paint. Did some dealers remove it in the 1990s? He also had never seen Interprotect fail like that. He wondered if it could be moisture trying to escape, but it was two weeks of very warm weather when I sanded the hull. Could the glass still be gassing? After 22 years? Some other contaminate? He strongly suggested I contact Hunter, so I am.
Interlux had no answers, they just said to spot sand, build up the patches with Interprotect, and repaint.
Any thoughts? You guys are always great at helping me solve such mysteries.
Thanks.
