I have used this gun for a couple of years with thin undercoating oil and have had no issues. Yesterday I tried spraying dripless undercoating oil which is somewhat thick and had waxy agglomerations in it. This is the place where I bought the oil http://www.monarchoil.com/products.php?cat=11 The product is WSUNDDRI It was 20C/70F ambient yesterday and the oil would just not come out of the gun. I turned the pressure up to 70 psi (did not want to go higher since I did not relish the thought of a oil bath) and the oil still would not flow. I am thinking of buying a Schutz gun at Canadian Tire http://www.canadiantire.ca/en/pdp/schutz-siphon-gun-0475761p.html Will it spray the dripless oil?