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Discussion Forum

Bondo Glazing and Spot Putty lifted primer

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08-21-2011 17:08:49

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I have never had this problem before and am not sure why it even happened. I shot the primer on early in the morning and let the parts dry out in the hot sun all day. After they had been drying for well over 8 hrs and felt dry and solid, I wet sanding down to s very smooth finish, getting them ready for color, after I got done sanding there were a couple little divots that were barely visible but I wanted a good smooth surface so I used to Bondo glazing and spot putty on the little spots to level them. When I put the putty back in the cabinets and by the time I turn around the paint had lifted where I put the putty. I used an oil based primer thinned with naptha, it went on great and was plenty dry. Has anyone ever had anything like this happen before. I typically use a lacquer or urethane primer but I had this primer in the garage and though I would use it for this tractor, it has been doing fine til this. I shot the whole tractor with this primer and already topcoated the chassis with no problem, but now I am on the sheetmetal and really wanting it smooth, so if it is going to react this way to the spot putty, I will have to strip it and go with another primer. Has anyone else had this problem?

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08-23-2011 08:05:26

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 Re: Bondo Glazing and Spot Putty lifted primer in reply to ih560, 08-21-2011 17:08:49  
the solvent in that fast cure glazing putty may have been something fast and agressive like hexane or similar fast flash solvent.. and likely disolved the primer.

i have been able to remove 'rattle can' overspray off of cured hardend paint, using a rag, wetted with mineral spirits or naptha, then just the corner dipped into laquer thinner, even after the rattle can paint had been on for hours.

had a buddy over at my shop and he was spray painting some lil widget he had made, and right next to that lil red widgit he was painting was my ford grey tractor hood.. I didn't notice the oversprayed droplets until much later.. came off clean though..

so it all depends on the solvent in that glaze putty, and the fact it was not a catylized / cured paint.. etc.


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08-22-2011 05:34:08

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 Re: Bondo Glazing and Spot Putty lifted primer in reply to ih560, 08-21-2011 17:08:49  
You may be using way too much putty. It's only use is for tiny pinholes and very light scratches. Should be applied and "wiped off" over the belemish with a rubber spatula. No more than .010 thick.

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Rod (NH)

08-21-2011 18:02:27

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 Re: Bondo Glazing and Spot Putty lifted primer in reply to ih560, 08-21-2011 17:08:49  
Using a single component, lacquer-based glazing/spot putty over an uncured enamel product will result in lifting. Your enamel primer may have been dry but it definitely was not cured. Try a two-component glazing putty instead.

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