Underseal schutz or Upol Gravitex or Raptor

[Lambretta-tom]

I am looking at removing the old flaky original under seal from my bus and adding some protection after some small repairs.
What do people recommend ? I've used Upol Gravitex on new car pans before and it gives a great though finish. I know Raptor can be tinted to give a finish colour.

Plan would be to strip current and clean up best i can do repairs etch prime any repairs, panel wipe and apply the gravitex black or maybe even Raptor and tint it white
Or as above but apply a schutz product like the 3M, Dinitrol or waxoil under seal type stuff

after some opinions please

Cheers

 

[Andy_sheff]

It's a crap job, I've been doing mine in stages when motivation allows! I scraped off the old underseal and gave it a wipe, then treated any Rust with dinitrol rc800 or rc900 then a coat of dinitrol 3125 then finally the dinitrol 4941

 

[Andy_sheff]

I did make the mistake of just scraping off and re coating with the the dinitrol over some light corrosion, but Ive learnt you need to treat any rust or it just causes the coating to flake off.