Subject: Re: M45 Frame
Further to my powder coating comments, I had a part powder coated a few years ago that had a riveted on piece. There was paint in the overlap which melted and ran out ruining the finish.
If you wanted to powder coat you would really need to remove the riveted on items so the shot blasting could clean behind. The shackle castings are a very tight fit in the front and rear of the chassis and you will not get them back in place if there is anything more than the thinnest of coating where they fit.
Personally I would remove the riveted on items, shot blast, then a thin primer put on after having done any repairs. I would then re-rivet the removed items and bolt the frame back together (making sure any brackets that were held by the main bolts were back on). Then paint the whole chassis as a unit. . . .
David