flaking antifoul

if you are just patching then put on some primer e.g. promocon followed by anti foul.

if stripping completely then don't do as I did (scrape it off by hand using a scraper/chisel - it takes 3- 4 back breaking days). Get some one in to blast it/soda clean it!
 
If it's eroding antifoul I'd leave it. I'm assuming that you have several layers and now the flaking is making the hull look awful. Buy a decent "pull" scraper from the DIY superstore (grind a small radius to each end of the blade to avoid damage), scrape the lose flakes and antifoul the bare hull. Don't paint over the peaks, just the valleys. Over a couple of seasons the dreadful flaking appearance should go, as if by magic. Did for me.
 
alteredoutlook said:
if you are just patching then put on some primer e.g. promocon followed by anti foul.

if stripping completely then don't do as I did (scrape it off by hand using a scraper/chisel - it takes 3- 4 back breaking days). Get some one in to blast it/soda clean it!
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+1 - scraping it is an awful job and end up looking like a giant smurf... currently changing mine to Coppercoat so I never have to do it again.
 
I actually found i could chip it with a sharp square bladed chipping hammer. Or at least the thick bits round the waterline.
I am not sure you need soda blasting. I have put on coppercoat & had the boat sand blasted as it was much cheaper.
Did not do any major harm to the gelcoat but there was a small amount of antifoul left in patches. But as i sanded the hull to a full white finish i took more gel oat off sanding than the sand blasting did
Several boats in our marina have been done by the same chap in the same way
£250-00 for a 31 ft fin keel
 
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