I have Nyalic on my hull and would NOT do it again it is just to soft there are other 2 pot clear coating that are a lot harder now days so have a look at them. JMHO

yep had nyalic on my last two boats, above water line though and found it hard as nails,except where petrol has been in contact.Big thing though is who puts it on can make all the difference just like most things

Not much help from me Contract..except I have a Surtees 6.1 with topsides with Nyalic.... awesome looking! Keeps the boat looking new for years, especially if high wear areas covered with Scuffproof (a clear palstic film ) areas liek transom/anchor well area etc. I wouldn't bother with below the waterline myself, but topsides on ali. looks very good.

I am with Dohboy on this one. Have Nylac on the topsides of a boat and wouldn't do it again. I love the look when it is new, but it is very hard to patch when it gets scratched due to the need to acid wash again. Definitely need something on top of it everywhere people stand on the gunnels when boarding etc. Nylac HATES petrol, so think about what you will do around the filler and breather.

alidean acid [ clear for clear finishes] or amber for painted finishes,

Hi I have got a two pot expoxy on mine, its very hard wearing and petrol doesn't take it off.. looks great and easy to clean!!

I put a 2 pot enamel on my boat years ago, very hard wearing, had anchors, chains dredges dragged over it.
Am looking at a boat with nyalic on it that is looking awful.
Any bright ideas to get it off other than a big tin of petrol and a gas mask?

Nyalic was basically designed to prevent corrosion of ali where seawater has been on it without going for a painted finish.  It would be good to do the whole hull if you do anything at all, as the bit that's in the water needs as much protection as what's out of it.  Plus it avoids the line effect where one isn't and one is coated.  Nyalic doesn't do any solvents, some cleaners and even skin oils that are acidic.