Lacquer primer is one of the worst as far as adhesion. Epoxy primer is the best and can be used under anything, or over anything for that matter. The lack of adhesion is stated in the instructions for some lacquer primers that say sand AND use etch primer before applications. If you get by with ospho or any phosphoric acid product on cast ok, but I'm not going to try it. Mainly because I remove all the rust I can with a wire wheel on an angle grinder. IMO any rust remaining in the pores of the cast will be sealed in by the epoxy. Some may disagree with the last statement, but epoxy is as good as it gets. The only paint lifting I have seen occurred because I messed up with the application one way or another. I seldom use any phosphoric acid on sheet metal because there is zero rust when I am done. If there is any "microscopic" rust, the epoxy takes care of it. If I ever run into any (the hood on my Super M is badly pitted) I will use Picklex 20 and sand off the residue before it is painted. Picklex does not have to be washed off.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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