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epoxy primer over alkyd primer?

N

Nebraska Kirk

Well-known Member
Can a two part epoxy primer be successfully sprayed over an alkyd enamel primer? Will the epoxy bond and seal properly to the alkyd, or are they not compatible?
 
You could but I'm wondering why do you want to? Putting epoxy primer over alkyd you would loose the benefits of the epoxy primer. Putting epoxy over bare metal provides an excellent moisture barrier and makes the overall finish more durable. Having the alkyd on there just weakens the entire finish. If you are not going to take the alkyd primer off I would check the compatibility of the topcoat you are using to the alkyd and just topcoat over it.
 
I did not say I wanted to or was going to put epoxy over alkyd, I just asked if it could be done.

So, putting the appropriate alkyd top coat over the alkyd primer will provide enough of a protection against moisture? I am restoring an engine that I will be painting, this is my first time painting anything that I have restored. This engine will be outside only at shows and will be stored inside at all other times.
 
Sorry, your initial post suggested you painted something with alkyd and then decided to change to epoxy. My initial thought was at the expense of the epoxy primer being wasted with alkyd primer under it. To answer your question better you could have a car with some of it stripped to bare metal, some of it with finished paint, some of it patched with bondo and some of it with alkyd primer and epoxy prime over the entire thing. Of course any previous coatings would have to be scuffed first. Not that this would be the best procedure but it would work.
 
I don't know if they are compatible or not, but you will be trying to use an excellent primer over a lousy primer. Remove the alkyd and use the epoxy. If it fails you are wasting epoxy which costs 4 times that of alkyd.
 
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