If you are using the old alkyd enamels that were used on the older tractors, you are correct in that primer was not usually used. It is necessary for acrylic enamel and the urethanes. Problem with not using it, even with alkyd, is that when you get a paint chip, or if the paint is not "stuck" very well, you get rust in that area which will work under the remaining paint. Epoxy primer has excellent adhesion properties both to the metal and topcoat, and is water proof. In addition to giving better adhesion to the topcoat, minor chips will usually only go to the primer, meaning no rust. But, I will agree that if you use alkyd and keep the tractor inside, you may never know the difference. But, I have a Farmall M, painted shortly before I bought it, that apparantly was stripped to bare metal and repainted without primer. The alkyd simply wore off (not abused), thus there is now rust, in addition to severely faded paint due to it being outside.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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