Loose Patches of Antifoul

[sailingjupiter]

I'm looking to antifoul this weekend. There are patches of loose antifoul on an otherwise good conditioned hull. I was wanting to just re apply antifoul around the waterline and the where its loose.

Whats the best was to get rid of the flakey bits. Is wet and dry best and what level of grit paper?

Thanks again

 

[Phoenix of Hamble]

scrape and then gentle sand.... remember a face mask... the dust isn't very good for you!!!!!!

 

[johnalison]

I agree, but I found it easier to use a rotary sander with fully variable speed to feather the edges and ended up with a better result and less risk to the epoxy layer. You should re-prime the patches as well to improve adhesion.

 

[Spuddy]

For this purpose, scrape then use coarse wet/dry - no point in aiming for super smooth surface. If loose patches get down to hull surface then a spot of Primacon or similar would be a good idea

 

[oldestgit]

Scrape the dodgy patches off, then use 180 grit wet and dry with water either a bucket or preferably a slow hose, then Primacon and go…

By way of making life easier for myself I bough a floor mop (about £10) with a foam folding head one of those you push part down to fold the head and squeeze the water out, I then covered the sponge in a full sheet of 180grit W&Dry and manage to do the job without too much bending or getting wet.

Peter

 

[roberth]

Last season, I did what Spuddy and Oldestgit suggest and it worked a treat. A few new loose patches showed up this season, and they have had the same treatment.

Best way of spotting is at lift out - wait an hour for a/foul to dry, and the flakey patches are easy to spot as they tend to hold the damp. Scrape back there and then - saves finding bits when you are trying to put a decent coat on and the boat's due back inthe water the next day!

I also "filled" the scraped and primed areas with a couple of layers of antifoul to smooth out a bit.

On my boat at least, the flaking is a sign that I have too much old antifoul building up, and it's losing its adhesion. I should really scrape everything back to gelcoat and start again (next year?), but this method works well as a stop-gap.

 

[Lakesailor]

I'm just doing a Prelude 19 that's antifoul-sick at the moment. 1" chisel and lots of elbow grease. It'll take about 15 hours to strip. Then an orbital sander and 120grit (Breathing mask!). Roller on a primer and then antifoul last after the topsides have been done.

 

[roberth]

Thanks - what are you doing next winter???

 

[Phoenix of Hamble]

He's busy... doing my new boat..... look what a good job he did the season before...

/forums/images/graemlins/laugh.gif/forums/images/graemlins/laugh.gif

 

[johnalison]

This is what I had to do. First, scrape the loose stuff off & prime

then sand down the edges

then another coat of Primacon

 

[roberth]

Didn't he do well...