Eastwood Internal Frame Coating w/Spray Nozzle
Product Review (submitted on August 10, 2010):
I used this in the rocker panels on my 65 VW squareback. No access from anywhere but the trim holes, so just poked the hose in and sprayed everywhere up and down the rocker. I tried it out in a pop bottle and it coated everywhere pretty well so I think it should coat inside the rockers easily.