I use a moisture trap with a filter in it at the compressor along with another regulator,I put fittings on it so I only use it when painting,you can also get those little round orange filters that go on the end of the gun as extra insurance for anything left in the hose.You'll still have to drain your tank now and then just so you dont overload you filters.Go to "helpful links"check out the stuff Autobodydepot sells.it will give you an idea of whats available for filtering air.