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Old 09-12-2018, 12:10 PM   #1
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Primer...

Admins/Mods,
You guys have been slacking in that there are no stickies with Primer in the title.

Members,
You guys are almost as slack as the Admins/Mods. There are only a handful of threads (most VERY old) with primer in the title. The newest being 2017 and priming engines for starting. Phfft.


With that out of the way, some questions:


1) BRAND specific, what is the recommendation for exterior automotive paint primers? I'm fine with using oil based primers and that's what I'm looking for (I think).

2) Are Ospho, Corroseal, etc. rust pretreatments needed/wanted if using a self etching primer?

3) Are two part (hardener) primers better? Will they work in conjunction with the rust treatments?

4) With roughly 400 sq ft to prime, how much do I need (quart, gallon)?

5) What short cuts are acceptable?


I know that last one is a loaded question. I'm not looking to roll on latex exterior paint. But I'm also not looking for having to do 6 coats of paint with sanding between every step. I'm not looking to turn the bus into a show car. That requires far too much patience much less money.


I'll be using a sprayer albeit a $50 spray gun. I don't want to use the rust treatment only to mess the adhesion up by using an etching primer over top of it. I'm envisioning huge sheets of paint peeling off. I've no idea if that is a thing or not. I know enough not to use house paint but that's about it.


The sheet metal I have was bought last year. It's inside the bus and only has surface rust on one sheet and only where water was dripping on it. It's steel and 16 gauge 4x8 and 4x10 sheets. Aside from that, I don't know what coatings it has or doesn't have.


It looks something like this:
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File Type: jpg Sheet metal.jpg (359.5 KB, 123 views)
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Old 09-12-2018, 12:30 PM   #2
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For your purposes I'd just use Rusto. Gallons, not spray cans. Add a hardener to the exterior paint.
I get gallons of Rusto primer for $25.
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Old 09-12-2018, 12:48 PM   #3
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Originally Posted by EastCoastCB View Post
For your purposes I'd just use Rusto. Gallons, not spray cans.
I did that for interior and exterior only quart not gallon in the colors I wanted. Should have used gallon on interior since it's needing redone.



Quote:
Add a hardener to the exterior paint.
I didn't do this. Directions (I think) didn't mention hardener. It mentioned thinning it for the sprayer but that's about it. I do still have an empty can I could read.


Quote:
I get gallons of Rusto primer for $25.
Paint or primer? It was $17 I think for a quart of paint. But then it wasn't John Deer green or FarmAll red either. Nor was it plain old white, black, gray, whatever.
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Old 09-12-2018, 01:07 PM   #4
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Quote:
Originally Posted by Brewerbob View Post
I did that for interior and exterior only quart not gallon in the colors I wanted. Should have used gallon on interior since it's needing redone.



I didn't do this. Directions (I think) didn't mention hardener. It mentioned thinning it for the sprayer but that's about it. I do still have an empty can I could read.


Paint or primer? It was $17 I think for a quart of paint. But then it wasn't John Deer green or FarmAll red either. Nor was it plain old white, black, gray, whatever.
Paint OR primer are $25 a gallon here.
The hardener is at tractor supply. "majick" brand or something like that. Enamel hardener. You don't have to use it. But its good to use it on the exterior.
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Old 09-12-2018, 01:15 PM   #5
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Quote:
Originally Posted by EastCoastCB View Post
Paint OR primer are $25 a gallon here.
That's because you don't live in the Land of Jacked Up Prices.


Quote:
The hardener is at tractor supply. "majick" brand or something like that. Enamel hardener. You don't have to use it. But its good to use it on the exterior.
Is that legal? If I use Rusto paint with Acme hardener, won't it explode or something? I don't normally believe in all the hype on labels. Use only Kraft mayo with Starkist tuna because we own both companies and love our profit margins.



But with my luck, Rusto can't be combined with ANY hardener or can't be combined with this brand because secret ingredients that have a chemical reaction.



I can tell you what happens when you mix acetone with a water based paint. You get separated milk. The first can of Rusto was water based and I grabbed it because some a-hole left it in the oil based section. Right color, right brand, ... I'm good to go. Add thinner, shake can, and what the hell?!!?
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Old 09-12-2018, 01:26 PM   #6
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Quote:
Originally Posted by Brewerbob View Post
That's because you don't live in the Land of Jacked Up Prices.


Is that legal? If I use Rusto paint with Acme hardener, won't it explode or something? I don't normally believe in all the hype on labels. Use only Kraft mayo with Starkist tuna because we own both companies and love our profit margins.



But with my luck, Rusto can't be combined with ANY hardener or can't be combined with this brand because secret ingredients that have a chemical reaction.



I can tell you what happens when you mix acetone with a water based paint. You get separated milk. The first can of Rusto was water based and I grabbed it because some a-hole left it in the oil based section. Right color, right brand, ... I'm good to go. Add thinner, shake can, and what the hell?!!?
I've painted a whole bus and half another with Rusto + enamel hardener. It won't blow up.
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Old 09-12-2018, 01:29 PM   #7
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paint system

primer color coat later on clear coat the bummer is if dont do this right, the clear coat is not going to stick.

all the same brand to avoid interaction problems....

urethane paint ppg deltron primers on up.

william
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Old 09-18-2018, 06:03 PM   #8
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Oil or Acrylic for the exterior? I'm about to do mine.
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Old 09-19-2018, 08:04 AM   #9
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Quote:
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Oil or Acrylic for the exterior? I'm about to do mine.
I'm thinking oil. Don't know what acrylic costs or if it's easily available.
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Old 09-19-2018, 08:41 AM   #10
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Oil or alkyd (NOT to be confused with acrylic). Best for metal. Water based paint is caca on metal. Detroit has been trying to make it work to keep the EPA happy but with piss poor results even with all their high tech application & drying systems.
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