I absolutely refuse to use sloshing compounds in floats or wet wing fuel tanks for that matter. Either build/fix them right the first time or find a new occupation. Sloshing compound will ALWAYS come back to bite you in the Advise your students to never.. and I mean never.. use sloshing compound as an "out" to doing the job right the first time. Do not under any circumstances follow some kit builders suggestions of sloshing your fuel tanks after using proseal/seal pac/chem pac/ sealing compounds. If you use the sealers correctly, when building, you won't have leaks. Throwing slosh on top of it is a disaster waiting to happen... when it peels off in a sheet and smothers your fuel outlet screen. Things get really quiet after that... well other than your passenger screaming that is....