|Antique Tractor Paint and Bodywork|
Re: Self etching vs epoxy primer
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Hate to go digging up old threads, but I'm just scanning through things a bit. Some of the advice given in this thread is simply not good or untrue.
Etching primers have some amount of acidity to them and thus "etch" into the surface of the metal. They dry fairly fast and are thus still in a lot of use today in the repair industry, however they are considered to be 'old technology.'
Etching primers a lot of the time aren't even recommended to be topcoated and those I have used certainly DO have a recoat window (8 hours, for instance). They also are more likely to have chromates in them which are bad news for health, especially for a hobbyist that may not have clean air supply.
Epoxy is more durable, I can agree with this statement. It is no more difficult to use either. I've heard people say it can be more finicky on a contaminated surface, but I've apparently been doing a good job with surface prep because I have yet to see this issue.
The epoxies which I have used have a 24 hour recoat window.
To the OP - specifics are either on the label or in a TDS (technical data sheet) you can usually find online by punching in the brand/part number of the product you have. It will tell you recoat times and surface prep info.
If you have used etching primer on some parts and are planning to top coat them soon, I would strongly recommend you scuff the surface and apply some form of sealer primer to them before painting.
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