I went to start preping my frame for de Por-15, I have some good rust scaling goin on, My frame is Boxed I know its rusting on the inside rails I can see it wif a light threw the factory holes in the frame, How do I get the inside of my frame 1 Cleaned for por 15 and 2 how do I get the por 15 inside the frame shy of plugin what few factory holes there are and filling the frame and shaking it to cover all sides

Otto