You might want to clean the gel coat real good first depending on its condition with something a little harsher than
AIO. For the water scum stains, I use a product called ON/OFF. Use rubber gloves and paint it on, and it removes just about any stain. Follow up with your
KLASSE twins....
On my boat I use Zaino, on my dad's we use NU FINISH. NU finish is a great one step product for a boat. IF there is some chaukyness or oxidation, you will have to start with some 3M abrasives first to give the sealant something to BITE into and bond...........
Good luck....
<img src=http://albums.photopoint.com/j/View?u=1575126&a=12035449&p=43467511>
My old 23' RAVEN and my dad's Silverton 30X