Hi Keith,
Thats probably the TK spray on antifouling,great when you spray it on but makes a right mess of the leg in the water. I have the TK grey on the leg at present but still getting growth on the leg.Ive been looking at the Prop o Drev and Trilux 33, will end up giving one of these a go as I dont see anything else on the market !!!!!
Davey....................