Join Date: May 2005
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The problem with undercoating guns in general like UPOL's and Dominion Sure Seal's is 10 new guns will spray 10 different ways.
3M has an HD undercoating gun but retail has to be $75 now for what costs them $5 to import in quantity.
We have sold 1000's of Geo/Walcom undercoating guns for Geo/Walcom (we don't make a penny on them) because its a consistent quality build with an adjustable fluid tip. Retail is around $35 but they can be had for less usually.
The trick to making a low end undercoating gun work is cut the ~3" tip at the end of the gun where the material sprays out by 1/2-2/3. This allows more fluid to come out at once and the fan is wider.
Something else that works but is a little slow is one of the sand balsting guns you pick up at Napa for ~$35 that consists of the gun, hose and wide 'lid' on the hose that is meant to fit a lacquer primer type can opening. I tested one of these numerous times and it spray an HVLP like pattern that is very low over spray.
A 'solvent' ready hopper gun that costs $75 at Home Rip-Off will work too but you can't adjust it with bedliner in it. My suggestion would be start on the smallest or 2nd smallest hole.
The can that screws to an undercoating can is called a Philcan and they have both Euro and SAE threads. The UPOL gun along with the Gravitex cans that go on them are EURO threads while the 3M gun sold in the US is SAE. The Philcan we supply is SAE but Geo/Walcom offers their gun it in both EURO and SAE. The SAE Geo undercoating gun is part #4535.