After 2 years using Fluid Film, bought in bulk 5 gallon pails and then spraying using a cheaper undercoating gun, I'm looking for alternatives because it's still pretty damn expensive. Rust kills vehicles here in NY and the only way to help prolong them is to actively prep the whole undercarriage every year. Fluid Film requires a minimum of once a year application, suggested twice a year. In my search for an alternative I came across homemade Waxoil. It's this basic formula: 1 gallon mineral spirits, 1 pound wax, 1 quart 30 weight non detergent oil. Heat up the mineral spirits, shave the wax into it with a cheese grater, make sure all is melted and add the oil. Apparently it can be sprayed on using a normal household spray bottle even. And apparently it lasts for quite a while longer, maybe years, in the harsh environment of winter driving. Similar stuff has been used on firearms and machinery and lasts many decades if not disturbed. Plus it's cheaper, just maybe not as convenient. I'll be trying it on a car that's never seen any of either undercoating and comes out of Florida so is very clean and only small spots of surface rust scattered about. Pretty good for a 17 year old car, and when we brought it home it had less than 45,000 miles on it. It's a Lexus ES300 which is just a glorified Toyota Camry with nicer rims and interior. It will be my test vehicle. My other test vehicle is a 1994 Cadillac Deville. It gets the Fluid Film.
And my old dump truck gets Fluid Film for now too, just to hopefully slow down its unfortunate cancer problem. I've patched the frame on it 3 times now!
I'm not hesitant to try this new stuff because many people use both coatings and are happy with either, I just want to try something different.
Have any of you guys tried either of these? Just curious.