interior passages
 

Has anyone used this 3M cavity wax.
I want treat my cab headliner panel interior with ospho again and then was thinking about using this after to help protect from moisture

https://www.3m.com/3M/en_US/collisio...vity-wax-plus/

Re: interior passages
 

Me personally..no..but I've seen alot of folks use it
Others have a long spray nozzle for coating inside frame rails and hard to reach areas

Re: interior passages
 

I used it on my rockers when i had to replace them, used the extension wand, sprays in a pattern, worked great, make sure youre done welding, its still flammable, lol