I take my sled just about anyware. I have a 20 ft alumaweld and have had no problems with it in the salt. Yes there has been some milky waterlines on my boat due to the saltchuck, but that happends to most boats anyways.

a few tips are always flush in fresh water afterwards wether you yank it out of the salt and drop it into a lake or river. If you flush follow your maintenance manual on flushing intructions, but I always let the water run through my pump after shutting down the engine for about 10 minutes. When you wash your sled, make sure you run fresh water over it inside and out. I recommend using "Salt-Away". I also use WD-40 on my runners on the bottom. One last product you might want to take a look at that will make it so clean, it will be cleaner then brand new is "Quick-n-brite" You can find it at the Puyallup fair, or order it at one of the "as-seen-on-TV" stores. This stuff works wonders for removing those milky-salt stains your aluminum takes on after about 3 trips on the saltchuck.