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Lets say that I primered some models weeks ago or even months ago, and I haven't gotten around to painting them. Is the primer as good as new or would it be better to put on a new coat? I know that the purpose of primer is to adhere to the plastic and to the paint, so is there any effect on the primer coat's ability to adhere to the paint if I wait a long time before I put the paint on?

Not really, as it is just adding a surface tec=xture for the paint to grab. However, if the models have been sitting along time you may need wash them to get the dust and oil off the primer.

 bowloflostcells wrote:
Lets say that I primered some models weeks ago or even months ago, and I haven't gotten around to painting them. Is the primer as good as new or would it be better to put on a new coat? I know that the purpose of primer is to adhere to the plastic and to the paint, so is there any effect on the primer coat's ability to adhere to the paint if I wait a long time before I put the paint on?

If they're stored in your normal house conditions I'd doubt it. Stored in a box out in a shed enduring multiple 40 degree summers (or 0 degree winters I guess) could well result in problems.