That the whole under carriage has been sprayed with what looks like pickup truck bed liner, it is thick and not peeling anywhere, anyone have this.

 

Yes many products, mine I think is waxoyl, basically a hard wax and oil sprayed and it dries to a hard finish, I top up with rubberized spray from time to time.

Consider yourself lucky it does help with combating rust.

 

I believe what you see is aftermarket undercoating that is applied to prevent rust and corrosion. Dealers sometimes offer it.

 

Zeibart Rustproofing is the name you could be looking for

 

Having spent most of a lifetime in a country where cars can rust overnight I'd be wary of any hard coverings / coatings or otherwise. These things offer a false sense of security and are targetted at those that prefer not to do regular maintenance of any 'treatment'.

The problem is that water can

a) Get in behind them
b) Air pockets can form in which subsequent condensation gets trapped - warnth of the day and cold of the night especially in winter condensation is certain.

I'd make sure that all the steelwork is left exposed and use a product such as Waxoyl. My grandfather used a blend of parrafin and old engine oil on his Triumph 2000 and it was totally rust free even after 30 years - alas the tree hugging brigade will be on slagging this method off but it works.

Keep the underside in good order, keep the protection intact, this means spending time in the overalls under the car with the maintenance sprays. I also drill holes into my inner sills so that protection can be sprayed in, close them off with rubber bungs. Take off the door furniture and clean out / spray inside the doors, hit the box sections wherever found internally and externally, keep drains open.

And never ever pressure wash a car underneath - water WILL get in where you don't want it under pressure and it will stay there. So if you have a clkassic that you're fond of don't take it out on salted roads - EVER. They now add molasses or something so that the salt sticks even worse than it used to.

If you have hard coating type underseal my advice is to get it off ....

 

Old timers used to advise spraying everything with a 50-50 mix of kerosene and engine oil, right down into the nooks and crannies. Then take a 20 mile drive on the dustiest dirt road you could find. That was rustproofing back in the day and, y'know, I think it probably worked!

Cheers
DD

 

Trust me - it does .... never clean off the dust just keep piling on the mix ....