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Antique Tractor Paint and Bodywork

Lacquer primer/surfacer confusion

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alan8n

05-20-2008 09:20:53




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I have been reading the archieves extensively and I must say, this Forum is a great resource.
So on to my question. I have a Ford 861 tractor that I have to fix a dent. Did all dinging, filling and sanding, sanding, sanding. I do not know for sure what is on the tractor now, but the color does match exactly the Tisco brand of alkyd enamel, and it DOES have a clear coat on the sheetmetal. I tried a small test patch on the inside rim area awhile ago to see if the Tisco paint I have was compatible, and after a month or so I have seen no problems. I wanted to avoid the iso dangers as much as possible so I wanted to go with a rattle can lacquer primer / surfacer until I read the archives. I found the general reluctance to use rattle can lacquer primer for reasons that included lifting, adhesion, old technology etc.... Yet I read the repeated suggestions of the PPG MP170 and MP181 combination. If I understand the MP181 it is a lacquer based primer /surfacer. So I am a little confused. IS the MP181 better or different then what you would get in a lacquer based rattle can ? Or is it that we want to keep to a "system" of products that would help the success of the project ?
Luckily the dent is in a spot that borders a few lines on the hood where I won"t have to blend into the existing paint, but I am still concerned about painting over the clear coat.
Should I go with the MP170 and then the MP181 or just use the MP181 ( or possibly the rattle can lacquer based surfacer)or any other suggestions that you may have.
Any opinions welcome...Thanks...Alan

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Circus

05-20-2008 16:42:52




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 Re: Lacquer primer/surfacer confusion in reply to alan8n, 05-20-2008 09:20:53  
Lacquer surfacer is problematic. Solvents attack underlying coats. Dries fast but reflows and shrinks under final finishes when warmed by the sun leaving visible gouges and scatch marks in the otherwise smooth surface. Adhesion is awful.



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CNKS

05-20-2008 14:13:45




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 Re: Lacquer primer/surfacer confusion in reply to alan8n, 05-20-2008 09:20:53  
Yes the 181 is better, it is real surfacer, not the diluted rattle can stuff. Almost any primer or paint in a pint/quart/gallon can is better than the "equivalent" in the rattle can. I don't use alkyd enamel, Tisco or otherwise, so I can't speak for the compatibility. The MP 170 will act as a sealer, and seal off the old paint, and I doubt if the 181 will react unfavorably with the Tisco paint, but I don't know that. That said, I have never had success blending paint, even when the paint was identical, but I'm not a pro. If it was mine I would do the whole hood.

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