Cavity wax aplication question

[kevin316i]

I have scraped off the sh*t put by a bodyshop on the inner rear wheelarches as rust prevention and plan to give the whole rear quarter area a good coat of cavity wax. However, my cleaning has managed to remove the very light coat of paint that was there leaving a grey paint (primer?)
Should I prime and paint before applying the wax or just apply the wax to the cleaned surface?

[Jesus325iTouring]

When I first got my Tourer,I scraped all the underseal off,and most of my skin in the process and set about re-sealing it.
I didn't re prime anything as it didn't seem it needed when I was about to apply super thick underseal.
Once the underseal was dry I then sprayed Waxoyl over the top of the underseal,thus sealing the fresh under seal and also sprayed into all the nooks and crannies that one can't do properly by hand.
I cant remember how I did it now but I also sprayed inside as many box sections as I could,i seem to recall you can get access from inside the car.
The car stank for weeks after,but the reult is two years later my chassis is still mint.

[Turbo-Brown]

It's not the best idea to cavity wax when the roads are wet as anything that's in the cavities will get sealed in by the wax.

Best to wait for a dry spell and go for a good drive to make sure everything's dry first

[kevin316i]

Thanks guys, I plan to just do the inside of the rear quarter panels first, and put the car back in the garage later in the year when doing inside the door panels.