I never used POR 15;therefore, I am not as knowledgable.
so often I had customers who brought in boats where they repaired but ithe boats were not repaired and I had to redo the repairs.
lookin briefly at the poop on POR 15, it pretty much is the same as all other instructions on prepping the keel. First lets start off, the keel is metal and cannot become water logged which is a fact. The first thing that must be done is to get back to a clean metal surface getting rid of the rust, dirt, old paint and so forth. Then clean off with acetone to get rid of grease, dust residue, etc....
I then coated the metal with zinc chromate which helped to keep the metal from rusting. The next was to fill in any holes or depressions with a two part epoxy filler and then sanded smooth. Then I applied 4 to 5 layers of Interprotect 2000 series barrier coat epoxy paint. When dry, I lightly sanded the epoxy paint and then applied anti fouling paint if that was reqired. This process worked every time.
Like I said, everything is in the prep work and that may have been the problem. Yes I did screw up once in a blue moon and it was my prep work. Once, I had an employee to bottom paint over non priming paint which called for the first coat of anti fouling paint within a certain specific time on a 29 footer. I left specfic instructions with the employee as I had gone to a meeting at Hunter. Several months later, the paint was flaking off. I found out my instructions were not followed to include other things that had gone on to include drinking while driving with a company vehicle. Needless to say, I pulled the boat out of the water and redid the job correctly.. I fired the employee over many things but DWI in my vehicle was the last straw.
crazy