The end-all Fluid Film thread

Fluid Film on matte black textured powder coat

Hey all: anyone ever have any issues with fluid film on powder coated steel bumpers? I haven’t found anything online that says it hurts the powder coat but interested what folks think and whether it is safe to use on powder coat as a preventative measure from winter and salty roads, when rocks chip the coating and expose metal. Thanks!
 
Interesting real world test video. The guy used some metal samples mounted on his frame.

Fluid Film Real World Test: Michigan Winter vs Truck Frame - YouTube

Given the results here it looks like fluid film washes off fairly easily. Especially if you plan to use an undercarriage pressure washer attachment for removing salt. My line of thinking is to apply fluid film to the inside of the frame only in the fall, where it will protect but not be washed off, then to use the pressure washer undercarriage attachment year round but especially after snow storms where salt has been applied.

Alternately you could apply fluid film everywhere under the truck (body and frame) and then skip the undercarriage wash but you would have to be very confident that you applied the fluid film it very thoroughly. I'm not that confident . Do people here use undercarriage washing after applying fluid film?
 
Do people here use undercarriage washing after applying fluid film?

Just brought an '07 4Runner from Texas to the rustiest part of the rust belt. Absolutely amazed at how clean this thing is underneath. That said I'm doing everything I can to keep it that way.

I can't speak on how well fluid film holds up to undercarriage washes but my guess would be not too well, especially after multiple washes. High pressure and soap will definitely take it off.

On reading this and other threads it seems a lot of car washes recirculate water which can get even more salt in places we certainly don't want it. My local car wash doesn't offer touchless without undercarriage so my move is suck it up and use the manual bays. Tends to yield better results and is a bit more cost effective as well (just not much fun in the winter).

Side note, I know this is a 6+ year old thread but as always big thanks to the community for all the info. Really like the way the black FF turned out!

dBkQw6n.jpeg
 
As a southerner who's recently moved to the northeast and seeing the effects of salt on the roads up here, I'm grabbing the bull by the horns and investing in serious undercarriage PRIMER and PAINT on my 4runner. I'm not going to coat the thing in fluid film every year, but maybe soak the inside of the doors a bit with that stuff. Otherwise, I'm going with some serious Mastercoat shit, before I let the rustbelt get the best of my investment. And mine is old. 2002 model. Whatever paint you use, it's better than oiling it every year. That's my opinion.
 
As a southerner who's recently moved to the northeast and seeing the effects of salt on the roads up here, I'm grabbing the bull by the horns and investing in serious undercarriage PRIMER and PAINT on my 4runner. I'm not going to coat the thing in fluid film every year, but maybe soak the inside of the doors a bit with that stuff. Otherwise, I'm going with some serious Mastercoat shit, before I let the rustbelt get the best of my investment. And mine is old. 2002 model. Whatever paint you use, it's better than oiling it every year. That's my opinion.

You're about to find the limit of primer and paint on boxed cavities in this environment.
 
Not recommended but I had a transmission cooler leak and my undercarriage is now nicely coated in rust preventative fluid lol
 

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