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We use those draw type scrapers at work Excellent for small areas I used one to do the whole of Great White , wouldn't do it again

A cabinet scrapper similar to this cabinet scrapper will remove a small area of antifoul without causing damage. I used one to strip all the antifouling of Awol when I had her with no damage

Thanks for the suggestions guys, very helpful. The boat is on the hard now, I'll be having a go tomorrow if I can bear the cold. As for Rob's input I couldn't possibly comment.

Hi Steve, I've scraped 2 boats...and the weapon of choice is a 3/4 inch wood chisel, to be used just after going ashore, when the antifoul is all crumbly still. If you wait, it still works, but is much harder work. The technique to use is to make one long straight clean strip on one side of your chosen area, then using half the width of the chisel blade, take off new rows, so your cleaned area gets progressively wider. Make sure each strip is clean, and then there's no bumps to make the chisel jump. Once the whole required area is clean, thinners and rags will remove the rest. I'd then cut the hole needed, then use an orbital sander to key the gel coat, ready for primer. Typically, you'll remove an area slightly larger than the transducer you're fitting, and make good with underwater epoxy and suitable sealants. The bare gel will need priming, before applying antifoul to the hull again. There's some specialist antifouls out there now specially for transducers, but they come in small pots and are incredibly expensive. Mike

If it was me I would use Acetone and plenty of rags, keeps it controlled and ready to reseal new transducers in. Plenty of fresh air or mask as you do it. Not to sure if it would take off Copperbot.