OK so I've got the Practical Sailor issue with their bottom paint
results. I am leaning towards the Interlux Fiberglass
Bottomkote since it has an anti-slime agent and its cost is reasonable.
So off I go to use the calculators that help me decide how many gallons I'll need. Varied results but to be safe I'll get 5 gallons for 2 coats (52ft * 15ft *.85) and maybe a 3rd around the waterline.
Problem is - I have NO idea what paint
was used by the PO. It's red and hard and it's apparently paint
since it stayed on for 18 months. I think he did a single
coat with a dry roller...
So - how do I know what prep work I need to do? I've read some threads that say DON'T sand the old paint. Some say use a chemical prep.
So which is correct? If the old paint is not coming off, can I just cover it? And how many coats can you use before you have to remove the old layers?