I don't know of any way to reliably determine what type of paint you have on your boat. The use of 2-part paint is much more uncommon than 1 part paint. If I were to guess, I would say you have one-part on your Tanzer. So you really most likely need to remove ALL of the paint inderneath. Don't feel so bad - I had latex on our decks mixed with non-skid!!!
BTW, I opted for one-part, even thought the hull was painted by the previous owner with two-part. I did not trust my abilities to get it done right with the two-part. I think the one-part is more forgiving.
1984 Wauquiez Pretorien