2. After using Grunt boat cleaner on my hull I noticed my newly applied antifoul is now all streaky from washing off. Has Grunt damaged the antifouling and will it still continue to work?
Grunt boat cleaner has not damaged your antifouling at all and it will continue to work as normal. Antifoul is water sensitive and will streak even with rainwater running down the hull, however it will all turn back to its normal uniform colour when immersed in the sea, river or lake.
Antifoul showing no streaking before boat is cleaned using Grunt! boat cleaner
Typical streaking on antifouling after cleaning with Grunt! boat cleaner, this will revert to solid blue following immersion in water.