Repainting Tractor

There usually is more than one way to do things. I'll give you my own opinion on this one. I admit to a bias AGAINST etching primers. They generally have too many restrictions on use for my liking. I believe DuPont's Variprime is a self-etching primer that is intended to be applied to bare steel ONLY. It may also need to be primed or sealed with another product prior to topcoating. You should get DuPont's technical data sheet for Variprime to confirm the conditions for use prior to making your final decision.

Generally, old paint that is cured, sound and not cracked or peeling can be painted over if scuff-sanded and the edges properly feathered out. To avoid any possible problems it is best to cover the old paint with a sealer prior to topcoating. My preference when bare, clean metal or old paint is to be topcoated is to use an epoxy primer over everything. The epoxy serves the dual purpose as an excellent bare metal primer plus being a sealer for the old paint. Epoxy can go over about anything and you can put about anything over it. That's what I would recommend in your situation.

You should do well with the Centari. It is an excellent acrylic enamel.

Rod