I ordered SPI GEO yesterday. I am hoping it has the option to adjust the material flow and has the capability to attach flexible extensions to spray undercoating material in those places that can not be sprayed otherwise. In my opinion, the perfect undercoating gun would have the ability to spray both epoxy primer and heavy bodied products (undercoating, sound deadner, insulation) not only on exposed surfaces but those areas that can not be reached in a normal application.
Right now I am working on replacing four cab corners on a 56 Ford Pickup Cab. Once the rusted cab corners are removed, the sheet metal is sandblasted. Then the sandblasted metal and replacements can be coated with epxoy. Where the replacement panels are going to be re attached, the metal should be bare to allow welding. Sand off epoxy in area to be welded and shoot with weld thru primer. Then weld replacement panels in place. What you have now is burned epxoy off any area inside the cavity. It would be nice to have a flexible extension wand that would reach those areas to add epxoy and undercoating after you are done.
One gun that would be dedicated to epoxy primer and undercoating (only for these concealed areas that are damaged after assembley) would be awesome.There is such a gun, but its for applying "cavity wax", and does nor recommend undercoating. Maybe "cavity wax" is a good option to correct this problem?