Planning on coating the underside of my bed with this product. Pro auto store brand.

Anyone have bad experiences doing this?

Thanks, Grin

 

Alot of guys don't like it, but I recently sandblasted my frame and body and it had some on from the previous owner and let me tell ya, it was a pain in the a## to get off. And once it was off the metal underneath had no rust on it so it apparently did it's job.

 

I just did it to the bottom of my cab this week. Got rid of all the rust, treated it with Ospho first and plan to paint it this weekend. Hopefully, it can prevent rust, as much as thats possible on these trucks

 

Bed was sand blasted...Ospho'd and rust prevent primer. Was planning on spraying the rubber coating on top.As a side note where this truck was coated many,many years ago is the only place without rust.

 

Using undercoating to cover rust is never a good idea but lots of people do it to hide the damage. Then of course it holds in the moisture and leads to more rust.

If your down to bare metal and give it a good priming or a good rust preventive treatment, then undercoating is a great way to go.

My 2 cents!

 

I use something like it to undercoat vintage 356 porsche 110 point show cars. Everyone is correct make sure the under car is as clean as you can possible clean it if you have light rust spots you may use por-15. Do not cover major flake rust with por 15 or undercoating. Get the shuts gun and make sure you cover every part of your body because you will have a hell of a time getting it off. Don't do it in direct sunlight or in high heat because you will get this spider webbing effect. Use a light finger on the triger and start up high in the body work your way down. One of the best things you can do before you start is make a tape line on the body where you would like the undercoating to stop and not get on the paint use paper to cover from the tape up the sides of the body and on top. the stuff goes every where. we tap off the body and paper about 16" up and bag the rest of the body.
If you have any questions please PM me and I will help with what I know.
Good luck,
Mike

 

how did it go with “undercoating in a can”

 

The problem with undercoating is if it cracks or splits moisture gets in between the undercoating and metal and it creates rust.
I'd never undercoat anything. Just primer and paint.

 

I’ve had great experiences with it over the years with my Broncos.
The good news about doing it to the cab is that most rubberized undercoatings will reduce some of the external noise being transmitted through the metal. Not as effective as a true sound deadener product perhaps, but definitely an enhancement.
Just did it recently to my 68 and by itself alone it made a notable difference and sound inside. Did it to my 71 over 40 years ago but wasn’t too concerned about noise back then and I also did a full interior carpet and insulation at the same time or about the same time. That one is very quiet going down the road.

out here rust is not a huge problem, so it was no more likely and I haven’t had any issues.
But also the rubberized versions in my case haven’t dried out enough to crack or check. They’ve remained intact.
I used some extra on the back of my chrome bumpers where they were uncoated and starting to rust. Many years later they looked fantastic on the backside.

Down on the frame they’ve stayed intact too, but they do fade over time so my answer to that is to occasionally topcoat them with a little black paint.
And yes, they are messy! But only during the application.😁😉