1973 Plymouth Duster repair and rebuild

mygasser said

get some cavity wax and the long nozzle, you can coat the inside of all the inaccessible areas then.
neil.

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Ok, I am looking at Cavity Wax. KBS seems to be highly liked, as well as 3M. It appears that the 3M has a better wand for a more complete coat. Do you have any brand recommendations?