Cause for concern?

[OAF]

In April this year I had my boat antifouled, it has covered about 400 miles so far since then, I had it lifted yesterday to have the bottom pressure washed off, before they started I noticed in several places the antifouled paint had come off, the bottom wasn't fouled at all apart from the props, shafts and a bit of weed growth on the water line, the patches without antifoul had no growth at all, question is, should I be concerned about these areas now or just leave it until next year when she gets antifouled again? Or do I get it done sooner rather than later?

 

[rafiki_]

Looks like the anti foil has come away from the hull, taking all the growth with it. In terms of what to do next, it really depends if you are in a high growth area.

 

[OAF]

Looks like the anti foil has come away from the hull, taking all the growth with it. In terms of what to do next, it really depends if you are in a high growth area.

Cheers rafiki for your reply,as I said there was no fouling at all on the bottom surface of the boat, because of that I have no reason to think that the areas that have the paint missing had any growth on them either, given the lack of growth I would say that we arent in too much of a bad area, plus we shouldn't get too much growth between now as autumn/winter is approaching.

I wasn't sure if the the antifoul has an other properties that I should be concerned about if missing?

 

[Nick_H]

Will you use the boat regularly through the winter? If so, it may be worth lifting and patching up the a/f, but otherwise i'd leave it until you lift and a/f in the spring. The old antifoul that has been exposed by the new flaking off will probabaly still have some life in it, so you wont necessarily get immediate fouling.

Either way, it sounds like you have an adhesion problem between your current a/f and the previous a/f it was painted onto, or maybe the old a/f wasn't cleaned properly before the new was put on. Either way, you may need to deal with that in the spring by scraping, sanding or blasting the hull.

 

[OAF]

Will you use the boat regularly through the winter? If so, it may be worth lifting and patching up the a/f, but otherwise i'd leave it until you lift and a/f in the spring. The old antifoul that has been exposed by the new flaking off will probabaly still have some life in it, so you wont necessarily get immediate fouling.

Either way, it sounds like you have an adhesion problem between your current a/f and the previous a/f it was painted onto, or maybe the old a/f wasn't cleaned properly before the new was put on. Either way, you may need to deal with that in the spring by scraping, sanding or blasting the hull.

Cheers Nick

I suspect that is is an adhesion problem, I didn't do it myself,but suspect that it wasn't done properly the original paint was a sort of self depleting coat that you could rub off with your hand, the new stuff is supposed to be a hard paint, I reckon the original paint wasnt prepared properly before the new coating, my main concern was if the paint had any other protecting policies that I needed to worry about, but it looks like not.

 

[oGaryo]

Cheers Nick

I suspect that is is an adhesion problem, I didn't do it myself,but suspect that it wasn't done properly the original paint was a sort of self depleting coat that you could rub off with your hand, the new stuff is supposed to be a hard paint, I reckon the original paint wasnt prepared properly before the new coating, my main concern was if the paint had any other protecting policies that I needed to worry about, but it looks like not.

may be wrong on this one but I thought that you needed to remove all the errodable antifoul before applying a hard antifoul, I'll check... hard on hard just needs avrading to give the new stuff a better grip

 

[rafiki_]

Gary is right, you need to ensure the compatibility of the new af with old. I had Raf taken back to the gel when we bought her, and have used the same af each time.

 

[volvopaul]

One thing I'll, say about the upper hamble is the weed grown compared to shamrock quay is horrendous, also the main anodes seem to wear out very quickly, so I'd watch that as well before it eats your props, as it did to the powles 46 behind me.

 

[OAF]

Anodes were about 40% wasted so I reckon they should last until nxt year, hopefully! It looks like the AF will need to be totally removed before it is repainted next time, how can that be achieved? Does it have to be grit blasted? Or is there another method?

 

[oGaryo]

Anodes were about 40% wasted so I reckon they should last until nxt year, hopefully! It looks like the AF will need to be totally removed before it is repainted next time, how can that be achieved? Does it have to be grit blasted? Or is there another method?

I've done a little reading since posting as I wasn't sure... the Hempel instructions for hard racing state this:

SURFACE Existing antifouling: Remove possible oil and grease, etc. with HEMPEL’S YACHT CLEANER
PREPARATION: 67601 followed by (high pressure) fresh water cleaning, also to remove possible weak structure of
leached antifouling. Allow the surface to dry before recoating. Sealer depends on type and
condition of existing antifouling.

So it maybe not the case of having to remove the lot and these guys sealed it instead but missed a few places when doing so... what I do know for sure is you need to be careful of what you put on in terms of chemical compatibilty, not just the antifoul type (hard, errodable etc)