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Originally Posted by Ryan
Also, I have 20litres of army green acrylic lacquer which I will be using to paint the old truck. Does anyone know what sort of primer I should use under it?
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Ryan, if it's acrylic, you had better use acrylic undercoat. Same brand would be ideal, if you can. If you had used an enamel or 2 pack underocat, you will have problems with adhesion or worse. You can paint enamel over acrylic, but definately NOT the other way around.
Acrylic over enamel will cause the enamel to react very badly to the solvents in the acrylic (thinner). You get a problem known as 'frying', where the enamel will wrinkle dramatically and come away from the surface it's covering. It can be mild, or it can look severe enough to appear as though you have just put a coat of paint stripper on it.
Acrylic can be satisfactorily sprayed over previous2 pack, provided certain steps were taken when the previous paint was applied. Best avoided though if at all possible.
What type of paint did you apply previously? If you are painting the surface for first time, and if bare metal, use an etch primer before you undercoat. You will achieve a far better adhesion over etch prime, compared with standard primer alone. If surfaces have already been primed, don't stress about it, it won't come tumbling off. Just that optimum grip is achieved with etch first. Incidentally, etch prime is only useful on bare metal. There is virtually nil advantage to using it as a primer unless you run out of primer and just want to finish that last little bit!
When you are applying the top coat, make sure you use thinner of the same brand as the paint you are spraying. Many people will say you can use 'general purpose' (G.P) thinner, but while this is OK you will get the very best atomisation and spraying quality with the right thinner.
Hope this helps, and if you already knew some of this, excuse me from preaching. It's not always information that people get told when they buy paint.
Love ya work
P.S: A good friend of mine, Andy Cusworth, gave me a good tip on how to store leftover paint in he tin. He said to pour a little of the thinner into the can just before you seal the lid again. Pour it gently so it stays on top, instead of mixing into the paint itself. It seals the paint underneath and the paint won't start to dry out. It works really well and was something I had not given any thought to....ever. You can teach an old dog.
