Are they doing the mechanical work, too? It takes a great deal of prep and care to sandblast without getting any grit into moving parts, so the order of work is critical.
In a restoration I did of a real basket case of a tractor, I went as follows:
1) A hot pressure washing and sand blasting of the entire, assembled chassis and motor, followed by an initial light but full coat of a primer to stave off rust. Even at this stage, the usual precautions were taken to keep the abrasive out of the inside of the tractor.
2) A complete disassembly for all mechanical work -- bearings, seals, motor and head work . . . The cleaning of parts at this stage necessarily took care of any residual abrasive that did get inside. Any chunks or ridges of paint or grease left around bolt-heads and such during sandblasting were cleaned up and primed during this stage.
3) The mechanical work and reassembly.
4) A thorough prep for final painting, including a thorough cleaning, degreasing (from handling) and touch up, where needed, of the primer coat.
5) Final painting of the entire reassembled tractor.
You don't say what the tractor is, so the order may change somewhat. Mine was a Farmall BN, so it was relatively easy to paint as a whole as was done at the factory. If your tractor has frame rails, for instance, you might paint the chassis and motor separately before assembly.
The two most important parts in the order, the way I went at it, are:
1) If the mechanical work is all done, it is critical that your paint shop understands tractors and takes every care to keep abrasives out of the mechanical parts. This means SEALING all intakes and the exhaust, and any openings into things like the torque tube (there's a clutch, bearing and other things in there) and brake housings . . .
2) Painting before the mechanical work will result in breaking and chipping the paint during disassembly, scuffing up bolts and the like, all of which can only lead to a costly detailing once that work is done.
Maybe it's a nickel's worth, but that's my two cents.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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