Treating rust in impossible and hard to get to areas. 60 owners with roof rust take note.
Siphon feed engine cleaning gun.
These things are great for spaying Ospho, Phosphoric Acid, Metal Prep, Rust paint, POR15 etc into impossible to reach areas such as the backside of the roof gutter area, inside rocker panels, inside frame rails, under pinch welds, inside doors, behind quarter panels, wheel wells, cracks, crevices, etc
Just put the siphon hose into whatever you want to spray.
The hose always gets in the way on ones with the siphon hose near the tip. Harbor Freight has ones with the pickup hose on the back, but they clog up and have to thrown away because the venturi is inside near the back.
I found these on
Ebay with the pickup hose near the back and venturi in the front. These work really well.
AIR TOOL OIL ENGINE CLEANING GUN SOLVENT AIR SPRAYER DEGREASER AUTOMOTIVE TOOL 91044322845 | eBay
Eastwood Internal Frame Coating can be used. It’s convenient and will treat and reach in even further areas. , but at $22 and the can empties in two minutes, it’s not that economical to use.
On 60 roofs I'll partially remove the headliner, spray Osho into backside of roof area, let it dry a couple days, then spray in POR15 or MasterCoat.