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Primer is a heavier bodied bodied product than paint. It goes on thicker and not as prone to see or react to problems like contamination. Primer sets up faster than paint as well, it's not cured it's just set up' even if your using an epoxy and it feels dry, it's still curing.
If it's going to 70-74 tomorrow, I'd paint tomorrow and if you have the correct medium activator, I would use the medium.
Ray
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