"(Crawling out of the cave I have been hiding in)" Rich you could throw one of those disposable inline filters on the end of your hose just in front of the gun, works good to keep moisture and oil from causing impurities in the finish. I have a few that I would give you if my stuff wasn't in storage 400 miles away. But you can get them cheap at a northern, harbor freight places, like 3 in a pack for 6 bucks or something.....I think its been awhile.
Scott
