i have just done mine inside the chassis with dinitrol cavity wax, 5 litres on a 90 using a compressor and a schutz gun and extension. was easy took half a day and not much mess. i plan on doing it every 4 or 5 years (its a seconds car and does about 3k a year)

i just painted the outside of the chassis with chassis paint so that its easy to inspect and repair/paint etc and clean. most chassis rust inside out, and i jetwash mine regularly anyway
 
Waxoil is my choice.

Applied neat but very very hot so nice and runny.
A good clean and scrape before you do it.

If its a p38, take the arch liners out so that you can get everywhere.

The guy who just bought mine was amazed with the condition of the underneath.

Enjoy
 
I have a 10% discount code for Dinitrol.......if anyone's interested pm me.....just used it to order off the official site


P
 
Should have this completed by Weds....using some waxoil in some places...ie under plastic wheel arch liners


P
 
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