If the paint in question is truly in good condition then the only thing you will need to do for it is get is very clean. Wire brushing, pressure washing, anything to get rid of surface grime and dirt. It is prefferable to sand the paint however that may prove to be quite an undertaking. After you have cleaned the surface and degreased it you can sand the largest, most easily reached areas by hand using a scratch pad from 3M. I use the dark red ones as they cut quickly and leave a good texture. The hard to reach areas can be treated using any number of adhesion promoters. Bull Dog comes either in spray cans for small areas or in quarts for larger areas and is sprayed on with a paint gun. Ther is another more costly product called Flash Bond 300 that comes in gallons and quarts but no spray cans. These adhesion promoters actually "glue" the paint to the underlying surface making the paint stick even without sanding. When using Bull Dog or Flash Bond, you will need to be completely ready to paint the vehicle (tractor in this case) or at least the one color or part of the tractor that is to be painted. After masking off the area, and wiping it down after any sanding, you spray the Bull Dog directly onto the surface. As with any spray on liquid, 2 thin coats are better than 1 thick coat. Avoid runs (at least in highly visible areas) but make sure everything has a good layer of Bull Dog, even the sanded areas. By the time you can fill the gun with paint, mix the reducer and activator, the adhesion promoter has had time to tack up a bit and you are ready to paint. Start with a thin coat of paint to allow the Bull Dog to soak into the paint and get a firm "grip" on it. Let the paint tack up for several minutes and then spray the remaining coats of paint. I have used the Bull Dog in the top coats of paint to add a bit of flex to the paint. This is very helpful when painting plastic parts like bumber covers and such that you know will need to flex from time to time. The adhesion promoters help the paint remain flexible for added protection in certain areas. Hope this helps.
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