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.
 
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!
+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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