I only spray the frame web and the top and bottom of the lower flange, some overspray onto the coroplast near it but not the whole thing. I guess if you park in tall weeds, crawling insects might use them to get in, but that's about it. Take care around the tires not to get it into the brakes. I just put some cardboard between the frame and back of the tires. The spray itself, isn't as misty as a spray paint can, though. I run their sprayer at about 60psi. I bought theirs because I didn't have one.
Spray across the front of the rig, the rear stabilizers and the jacks. If hydraulic jacks, spraying the upper tube section should be enough. I have rear stabilizers, so I hit the arms in that, along with the outer tubes on my Ultra-Fab rods. I also spray across the back beam of the drop frame section. Doing the axles is OK, but I tend to do what I can hit without crawling underneath.
Takes me about 90 minutes to do my rig.
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