100LL use in 582

Yes, Use the Decalin. It isn't a cure all, but definetly helps. 

Thank you.  I've just ordered it.

Decalin, a bicyclic organic compound, is an industrial solvent. A colorless liquid with an aromatic odor, it is used as a solvent for many resins or fuel additives. It is the saturated analog of naphthalene and can be prepared from it by hydrogenation in the presence of a catalyst.

Cut and pasted from Wikipedia, make sure your fuel tanks are compatible. 

Fuel in this case is more corrosive than Decalin for plastics. The volume amount of Decalin used 1/2 oz. per 10 gallons is not enough to cause issues within a  fuel tank.

Yeah. It seems like the guys concerned about their tanks like me who can't get ethanol free autogas have done fine wil decalin. I haven't heard about any bad effects amongst the Kitfox community with 100LL and Decalin use, but lots of bad reports on ethanol belnded fuel use.