Rubberized undercoat question

Hey guys I have a Tacoma that has rubberized undercoating on it.i know it’s not good for the truck but previous owner had it installed.

now my question is could I put fluid film over the rubber coating and would it seap thru so it’ll protect the metal?

 

Theoretically, you can apply Fluid Film over the top of rubberized undercoating. Will it increase the corrosion resistance of the undercoating? Probably a little bit. Unfortunately, it will not give you the corrosion resistance of a properly applied layer of FF. That said, it's probably better than nothing and I doubt it will cause any actual harm.

 

Not sure you need to add FF to rubberized coating....my first Taco (1996) had undercoating and sold it 1 year ago...no rust without FF. I would put FF on areas that are missed and keep any drain holes on the frame clear. Do you have a lot of salt put down durning winter? keep flushing the underside of the truck...Taco's are notorious for frame rust....

 

Some of the undercoat is coming off and underneath I see some surface rust nothing major, frame is solid. So i was going to put some fluid film over it. I also live in the south so only salt on the road once a year. Thanks for the reply guys.

 

If you dont live in the rust belt, I wouldnt even bother.

 

Rubberized undercoating gets a lot of bad press.
Its not as bad as people try to make it out to be.

The problems that people have with it come down to two points;
1) Incorrect installation,
2) Lack of maintenance.


Regarding the incorrect installation, the BIGGEST problem is that it should only be installed when the vehicle is BRAND NEW (no rust). If you take a vehicle that is already rusty and then under hose it with rubber, then the rubber costing will actually do the opposite of what you put it there for. Specifically, if it is sprayed onto a NEW frame, it will seal water out and prevent it from rusting. If it is sprayed onto EXISTING RUST, then understanding that rust is porous, what will actually happen is that while not sealing water OUT, it WILL seal water IN. And since you're sealing it in to a place that already has rust, it means that the rust will get worse.

Proper maintenance involves this;
- Inspect it annually. If you see a spot where rust is beginning to form, scrape it really good, sand it, hit it with Rust Encapsulator, top coat, and undercoat.
- Oil it. This keeps the stuff pliable to prevent cracks, and seals water out of any cracks that might already exist.