How do I know if I have enough?

[Nessal]

I'm about to spray 2 doors and a hood tomorrow with primer. How much primer do I really need? Is a quart enough to get 2-3 coats on all of them inside and out? Or would I have to use way more then 1 quart to cover them? Thanks guys. BTW, the gun I'm using is a HVLP Devilbiss Finishline 3 set at 23psi at the gun.

[Phil V]

What brand and type of primer ? (makes a difference).

[Nessal]

HOK KP-21 Primer. It's a 2:1 ratio.


Hey Phil, I was also wondering if it's ok to spray in my garage without any airflow. The reason that I ask is because it's getting cold here and my reducer is only rated for 65-75F. I'll be lucky to even find the garage at 60F on it's own. So I was wondering if I can use like 3 of those electric heaters to heat the garage up to 65F then spray the primer. If I have airflow going through, there is no way for me to retain the heat. Btw, I do have a hobbyair that is routed to inside the garage from the outside. But it's only through a very small opening.

[Nessal]

Also, should I paint the doors and hood inside and out at the same time or do the underside first, let it dry, then do the top?

[Phil V]

Nessal, if it was me I'd keep the air flowing through the garage while spraying anything. Once your done priming you can seal the garage back up and turn the heat back on, which will not have any negative effects on your primer.
Why would you want to put 3 coats of primer under the hood and the inner doors ? I would think one coat of epoxy in those areas would be fine as long as there's no rust pits etc.

You asked about painting the door inners and outers at the same time or separately. If by painting you mean the same process of priming I would primer the inners and outer separately. Logistically it can be a real pain to position parts so you can primer the insides and the outsides. You would have to hang the parts from the ceiling in order to do both sides at the same time.

[Nessal]

Yeah I have the hooks already setup into the ceiling. I was planning on hanging them and spraying them. I figured I could do both sides this way...but if it's better to do one at a time, I'll make sure to tape and cover one side up before I spray then. I'll probably do what you say and keep the garage half open when I spray. Then shut it and crank up the heat when I'm done. The only problem is that it takes like an hour for the heaters to really do anything. So how much primer do you think I need to do 3 coats on the outside and 2 coats on the inside for 2 doors and a hood?

[Len]

I don't think you can lay that much primer on that many panels without using one and a half to two quarts of (ready to spray) material.