So I'm taking muh truck to Krown Rust Control (Canada) to

Undercoating in Canada has been actually pretty successful.

Krown is known for high quality stuff, and we used it in the military on all of our shit. A lot of government groups consider it mandatory.

Once you do it though, do not stop doing it. Look at all those surplus Crown Vics we have. RCMP starts selling them, and without the rust control shit on them every year they rusted apart some bloody quick.

File: 10251894_10153483931993357_7352412124218517129_n.jpg (48KB, 480x800px) Image search: [Google]

48KB, 480x800px

As long as there is no rust already and its dry & clean when you apply the undercoat it should be fine. Moisture can still get trapped afterwards if you scrape away parts of the coating, but generally its not a big issue.

They'll typically clean, brush and dry the underside before applying the coating

File: undercoat.jpg (176KB, 900x571px) Image search: [Google]

176KB, 900x571px

undercoat =/= krown.

krown sprays on some oil based bullshit that'll drip for DAYS. undercoat is usually that black rubberized shit you usually apply only once.

As far as I know, regular undercoating is just bitumen and rubber, while Krown actually has rust inhibiting stuff in it.

I myself have used Tectyl, it werks but has to be re-applied after a year or two.

Lets say I'm building a S30 and want to prevent it from further rusting. What would be my best option for a one and done solution?

File: 20161211_145901.jpg (3MB, 5312x2988px) Image search: [Google]

3MB, 5312x2988px

>>16303614
It's like painting over rust your just sealing in the the rust and in about 2 years it will come back
BUT they do make undercoats that kill the rust or stop it from growing
Pic related is my "undercoat" it's a spray on coat meant for underbodys but you can put it anywhere and it leaves the surface like a glaze and looks pretty good there's no signs of the rust I painted over coming threw and it's been sitting for about a year but it is meant to paint right over it to kill it

>>16303813
Check the 3M website itself, not vendors, for the best solution for your use case. 3M makes everything wonderful including undercoating. Follow the instructions.