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Painting woes

B

Bill in IL

Well-known Member
I have painted the frame of the tractor and some of the sheet metal parts used a gallon of paint with no problems. Now that I am working on the hoods, the part I really want to look nice I am having trouble. Paint in certain spots is raising up and cracking as in the picture. Whats going on. Using IH 2150 red from the dealer with rustoleum rusty metal primer under. Used a coat off brand majic I think sandable primer to help cut some rust pits wondering if the problem is coming from that.
11470.jpg
 
Reminds me of a paint problem I once had on my gas tank, that I had first cleaned with some sort of phosphoric-acid rust-stopper. As I recall I must not have got all the acid washed off, and I had a similar bubble-up.
 
You can't use anything but Rustoleum paint with Rustoleum primer. Rustoleum primer has fish oil in it,and that's what it does to regular paint. Learned that the hard way too.
 
If you use primer, alsays use the same brand primer as the finish coat, no matter what brand, and you will have much better luck. Speaking from experience.

Harold H
 
I messed up using a different thinner in the primer than in the top coat. I was trying to save time and used a faster thinner in the primer. I guess it was still giving off some fumes when I started painting.
 
It will also do that if you waited too long between coats. The preceding coat gets too much of a dry skin on it and then you dump on another wet coat and it will crinkle the skin from the first coat. If you waited more than an hour it was too long depending on temp . If it was over 80 degrees then a half hour is too long.
 
I have always wondered about the primer paint match. Never had any trouble till I used the sandable primer. Then I had a spot under the hood the bubbled.... sanded and still bubbled finally though its under the hood oh well. I waited about 5 days from first coat of paint till the second coat of paint. I know it says on the can coat within 3 hours or wait 48. Didn't do that on the rest of the tractor and it turned out good.

I did put down a good coat of phosphoric acid wash under the paint. Always had good luck with that in the past but never on this scale.

Still learning the hard way here... oh well looks like I will be sanding.
 
I'm not familiar with the paint you used but any enamel paint that says to recoat within a hour or two or wait a week is a quick dry enamel. On these type of enamels the solvents are too hot to use over an alkyd enamel primer. Now the paint that didn't wrinkle up is probably ok so you just need to fix the spot. I would sand the affected spot and let it set a month and fully cure and then paint over it. Avoid putting a thick wet coat on and let each coat dry a couple of weeks before recoating.
 
What type of primer would your recomend then for an alkyd enamel paint?

I did put on a wet heavy coat cause I was looking for a glossy finish coat.

Think I am gong to put the hoods on let the paint dry hard and paint again in a couple months.
 
My preference would be to use an epoxy primer.

On a pure alkyd enamel it would work to use it over the rustoluem rusty metal primer. If your topcoat says recoat within 3 hours or wait 48 hours then you should use at least use a quick dry metal primer. I bet if you look at the label on the topcoat it will say it has tolulene in it. This is too hot for the rustoleum primer.
 
Don't use rustolium Rusty metal primer. I am not sure what it is compatible with, but it did that to a paint job I did also. I have had excellent luck with Rustolium automotive primer - either light gray or dark gray. It seems to work under all tractor paints as well as acrylic enamel.

I mostly use John Deere Buff primer-sealer now. I have used it under Case-IH paint, acrylic enamel, and acrylic urethane.
 
Yea I am getting that impression here too.

Have always been happy with RMP but have used rust oleum top coat. Covers rust and holds to the elements very well. Easy to apply for a novice like me. I usually slop it on with a brush though.
 
I used the Rustolem Metal Primer and used the 2150 and had
pretty good results. Well good for me. I was a complete newby to
paint. I played with most of it but didn't have any cracks or runs. I
put it on really thin and put almost 5 coats of paint on. I know
thats wrong but it worked for me. I want to see what time does to
the paint though.
 
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