Paint problem.

dgoodman2

Member
What went wrong. I've done plenty painting but something new happened.

Painting implement. Sandblasted. Washed. Primed and the primer seems to have stuck good. Waited about hour and coated with IH paint. 2 coats about 30 min apart. Now after a day You can easily scratch off red with your finger. Just bump and comes off.

Also when I went to clean up sprayer I had a film on inside canister that paint thinner wouldn't remove. Had to wipe out like dried paint. Like paint hardened in there but I wasn't using hardener. I used a little naphtha thinner in the paint like I've always done. . Now my sprayer I've used 100 times clogged up. Have to reblast this implement. I'd like to know what happened before I do it again.

What happened. ???
 
I can't answer you questions but will suggest this idea. All paint is expensive, all prep work is laborsome. I only use what the manufacturer suggests for a reducer/hardener/additives. Things have worked that way for me. Maybe, just maybe there was some chemical separation of the paint in the can. Probably never know. I certainly feel your pain, to have to DO IT TWICE, makes it a very expensive project in time money and frustration. gobble
 
I was going to suggest you waited too long between recoats, but I went out and looked at a few cans of paint and in general recoating is within 2 hours or after 48 hours, and you were well within that.... I've had problems in the past where I came back in that 3-47 hour window and recoated, which caused the paint that was already on the piece to lose adhesion when the solvents in the fresh paint catalyzed the partially cured paint.
 
Paint formulations even one's you may be familiar with have changed alot in the past several years. They aren't the same anymore even from month to month with lower voc's and introduction of advanced methods of blending, compatability to naptha may have been diminished.
I've use the same method myself in the past. Naptha is a very fast reducer and may cause to cure to quickly. Please don't quote me but I had to learn the hard way. Get the TDS or technical data sheets and follow them exactly.
I don't believe anyone's paint is the same as it was even 5 years ago. I just recently learned that Martin Senior paint is now alll from Sherwin Williams. You have to be trained by Dupont in order to use the Axalta brand otherwise you can't even buy it.
It's all very confusing but your IH paint is probably fine with their sugested reducers.
 
That sucks. Since you have done this before, maybe talk to the guy you bought from. Could be bad batch?
 
Trying to decide whether throw away this fairly new quart of IH paint or try again with it. Something clearly happened with naptha thinner or something.

Bad thing is it looks great.
 
I would suggest stir up a ounce or 2 without naptha and try a test on something. I tried to find the TDS on your IH paint can't be sure that I found the right one. Is it Iron Clad paint from IH? If so it say's "Do Not Thin". It also says mineral spirits for clean up, which is a very slow reducer. That would suggest to me that the naptha may have been to hot or fast for it.
I didn't send the link for the TDS because didn't want send the wrong one and confuse the issue.
I'm way to cheap to throw it out without testing it.
"Bad thing is it looks great." Ain't that the kicker BTDT.
Barnyard Engineering wrote:

I was going to suggest you waited too long between recoats, but I went out and looked at a few cans of paint and in general recoating is within 2 hours or after 48 hours, and you were well within that.... I've had problems in the past where I came back in that 3-47 hour window and recoated, which caused the paint that was already on the piece to lose adhesion when the solvents in the fresh paint catalyzed the partially cured paint.

That may be precisely what happened. The naptha being added would shorten those time frames.
Please don't just take my word for it, try and find the right TDS and test your remaining product. Most paint cans have an 800 number on them to call for issues as well. Be prepared to be on hold before you get to a tech though.
 

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