JoeMini, did you attempt to spray the product into the (possibly) boxed-in joint between inner and outer rear fenders? What I mean, here, is the inner fender, AKA "wheelhouse" joins the quarter panel in a lap-seam that is the "wheel lip". Gen 2 was the first time that Mazda ran body seam sealer as a proper and machine-applied regular bead all the way along that lip, BTW.... Gen 1's were a disaster in that regard. In any case, rust often occurs from the inside of that boxed-in area... and I think it starts as condensation. Mazda's are notably poor with galvanizing according to some, and I am not sure whether the quarter panel is two-sided-galvanized. In any case my idea is to drill a number of 3/4" holes "along" the wheel lip, some distance away from the lip (obviously) in the rear wheelhouse. These would be plugged, subsequently, with "flushplugs" when all is done. Said holes would be made with a "coupon-retaining" 3/4" holesaw, with an adjustable-depth pilot drill. You would set the pilot drill 'real shallow so that you do not potentially damage the inner surface of the quarter panel....you don't want to touch that inner surface or b*gger it up.I see many gen 1 & 2 & 3 with rust around rear wheels and 3rd brake light. Now that what is visible . I doubt they had the car sprayed with some sort of rust retard / inhibitor. I knew i was going to keep this car (2012) well past 10years and was going to mod it ... After 3 - 4 years (applied product evevry year) i would find out ..did it work , is there rust , did the car stay clean underneath ( i should video it next time she is up on the lift) and I do not have any rust visible. If you intend on keeping the car a long time then do it !
It will keep all under parts from premature deterioration ...
Then, you would use something like the Bilt Hamber Dynax S-50 product to thoroughly coat the inside of that boxed cavity, concentrating on the seam between inner wheelhouse and quarter panel. Then, on with the flushplugs.
I was wondering, whether the "dog-leg" actually has a drain hole, immediately forward of the rear wheel? You would absolutely NOT want to plug that with this interior cavity rustproofing chemical.
Do Y'All agree with this plan? Has anyone done this?
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