Priming

Can anyone tell me if it matters what the temperature is outside when priming a car. Obviously it can't be extremely cold, but is the primer affected the same way as regular paint is from the cold?

Pretty much , you can counteract the cold a bit by gently warming the can of primer before shooting

I just shot a couple of smaller parts with primer outside and it's 37 F right now out there.
I did as Dag mentioned, make sure the can is warm, and don't linger outside with the parts either, get them back into the warmer inside as soon as you can to prevent any cold induced problems.

You could try warming the body up a bit too, just so the paint can flow bit more on the surface, not shock it into excessive orange peel or something. Be careful to only heat it gently, not melt it. When it is cold I hold both can and part in front of a small fan heater just before dashing outside. Can close, plastic bits well away.

Of course, here in Australia there aren't many cold days, it is usually nice and warm. Humidity can be a problem sometimes, especially up north. Living in country NSW the weather is warm and dry, so there is no excuse not to get out and paint!

hi,hav a question about priming.after i've done the putty work(fillin hole)then i covered it with 2 coat of primer and i still can see the putty mark on the area,do i hav to spray more coat of primer to covered it,or just spray the body color paint to cover it?can it be covered?the body color is tamiya yellow(TS-16)the primer that i used is tamiya white primer.

Where I live, it's quite humid which can cause paint problems. But I guess the temperature dosen't matter, just have to take some extra steps.

hi,hav a question about priming.after i've done the putty work(fillin hole)then i covered it with 2 coat of primer and i still can see the putty mark on the area,do i hav to spray more coat of primer to covered it,or just spray the body color paint to cover it?can it be covered?the body color is tamiya yellow(TS-16)the primer that i used is tamiya white primer.
another thin coat of putty , sand re-prime , sand again if needed. A good rule of thumb is if you can see it in primer it will really stand out when you paint it, paint hides nothing LOL!