Rustproofing inside frame

Joined
Apr 17, 2012
Messages
3,705
Location
West Michigan
so on my wife's truck I've been using Cosmoline RP342 for a number of years now and its working OK. Not perfect but pretty good, fluid film every year has been more effective on my 2011 but also a lot messier.

Anyways, thinking I should be fogging side the frame rails, too. Is there a good bulk sprayer for the Cosmoline that works well inside the frame rails? Alternatively I was thinking about doing one last coat with Rp342 this year followed by FF inside the rails and then going with FF yearly moving forward.
 
I use the aerosol cans of fluid film with the extension wand and 360 degree sprayer inside all the frame rails, works great. they're all over eBay and amazon.
 
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