Wow!! Thanks for the info!

PPG DDC/QT CONCEPT 34690 $68.55
PPG DCX61/HPT CATALYST $29.50
PPG DT870/QT URETHANE RED.-ME $16.15
PPG DP50LF/QT VOC Epoxy Primer $41.60
PPG DP402LF/PT EPOXY PRIMER CAT $24.00 ----- $179.80
Single stage urethane.

If I knew what I was doing, a QT of paint might be enough. $180 for paint is what got my attention. Real fast.

Check out the fleet colors? All manufacturers have them? Wha?
I am also about to spray the tractor parts down with OSPRO. This in fact is a base of phosphoric acid which seals the metal from rusting. It is my desire to reduce rust from coming back through the paint anytime soon.

Gentlemen, I thank you for your patience and great assistance in bringing me to enlightment and diminishing the great amount of my ignorance. It is my desire not to have to do this job again anytime soon especially with the labor involved with the total disassembly of the machine down to only the trans and diff still being bolted together. The expense of both time and money spent in cleaning each piece and the wife's great allowance of parts storage in the house on newspaper to keep them clean.

Anything is possible. Even no respirator at all. But it's generally not recommended.

I'll add another "IF" to CNKS's post. I know of no cartridge respirator manufacturer who recommends their product for use with isocyanates where the airborne concentration is unknown. That's usually the case in all DIY work. For example, 3M does recommend one of their organic vapor cartridges (when also used with a particulate prefilter) for isocyanates - but only up to an airborne concentration of 0.05 ppm, regardless of how fresh the cartridge is. Of course all other aspects, such as those CNKS indicates, must also be met. That means no facial hair for one thing and required fit testing. If the concentration is not known, then 3M recommends supplied-air, period. The National Institute of Occupational Safety and Health (NIOSH) recommends supplied-air for all exposure to isocyanates, no matter the concentration level. The fine print from either PPG or DuPont also leads to supplied-air, as does a wealth of other authoritative sources, some of which are legally binding in their jurisdiction. For DIYs though, it is a personal safety decision. They should make an informed one. The risk is theirs to take. Some seem to ignore the warnings and have apparently been able to get away with it. Others have not. I'm a typical backyard DIY and I went to supplied-air many years ago because of a bad experience with isocyanates in acrylic enamel hardener. I do not recommend a cartridge type of respirator when painting with materials containing isocyanates - even when done outside. I don't do it myself and I don't recommend it to others. The cost of the equipment is not great at all if you put any significant value on your own respiratory health.

You might want to investigate DuPont's NASON Fast-Dry acrylic enamel in addition to the PPG OMNI acrylic enamel mentioned. That should be comparably priced and can be used w/o a hardener additive. I have not used it myself. Either of those will be a lot lower in cost than the PPG DCC you were quoted. You might also look into the industrial/commercial lines of either DuPont or PPG. There are opportunities there for good, economical choices, depending on local availability and color selection. Look for either acrylic enamel or acrylic modified alkyd enamel. Other than that, you are pretty much left with the old chemistry alkyd enamels sold in tractor supply stores, hardware stores and home centers.

Rod