Thanks for inputs.
Petro Canada, wash include Underbody rust inhibitor, is for $12,
SuperWash Car Wash - Petro-Canada
I don't want to rely on the inhibitor thing.
Krown will cost $120 + tax = $135 each = $270 for both SUVs.
And it need to spray again anyway.
Fluid Film plan is to get Kit #1 that comes with 1 gallon, 1 spray can, air sprayer,
360 degree wand nozzle for spray can and hole plugs. for $120 delivered.
With it I can spray my 2 SUVs.
but I don't have air compressor, I need 2 HP 5 scfm compressor for $150~250... :shrug:
Instead of buying a compressor, I will try to use just regular spray plastic bottle.
which is needed to be warmed up in hot water pan. Then I can spray the underbody if my research works.
For the door, fender, panels, I will put the wand nozzle into the door's drain holes,
cargo door drain hole, rear stop lamps inner and fender corner gaps.
But I don't know how to access the rocker panel without drilling holes.
I hope I can access easily like this one;