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Old 06-24-2008, 01:47 PM
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paint compatibility question

doing up a truck for a friend and he got lacquer primer and i finished the bodywork. he changed his mind about the paint he wanted to use and wants to go with a urethane paint, which my supplier said wont work together. can i spray epoxy primer right over the lacquer primer with no problems?

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Old 06-24-2008, 02:26 PM
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lacquer primer..

Hi,im not a paint expert,but,i THINK you can use a primer sealer over the lacquer primer.
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Old 06-24-2008, 08:18 PM
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I've used laquer primer under nason base and clear with no problems. I would just let it dry a day or two before you paint over it.
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Old 06-24-2008, 08:55 PM
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You may be able spray it over lacquer but the lacquer is a problem itself. A paint job is only as good as it's foundation and lacquer is about the worst you could use. Why waste your epoxy spraying it over lacquer? Even if there is no compatibility problems the epoxy will just be wasted if you spray it over that junk. Lacquer is easy to sand off, very easy, so why not just sand it all off and then apply the epoxy to the bare metal like is is meant to be and then you will have a good solid foundation for your surfacer and paint. Lacquer is just plain bad news no matter what you put over it and NO WAY would I spray epoxy over lacquer!
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Old 06-25-2008, 12:23 AM
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Lacquer will wrinkle under the solvents used in Epoxy, won't it?
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Old 06-25-2008, 06:13 AM
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Lacquer and all 1K products in general will never wrinkle/lift but will forever be soluable. Only 2K products will wrinkle/lift. You can put urethane and epoxy products over that lacquer but the lifespan of the job will depend on when the lacquer will fail.
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Old 06-25-2008, 06:41 AM
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If you have to spray over lacquer, the longer you wait before
covering it up, the better.
Lacquer continues to dry/shrink for a long time, weeks, maybe months.
But it also allows water to go right through it so it needs to be kept dry
and clean before painting over.
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Old 06-25-2008, 12:45 PM
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I Shot my 57 with Imron over lac but used a good sealer in between. It
looked perfect for 16 yrs till I stripped it to change colors
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Old 06-25-2008, 02:30 PM
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The lacquer is a weak point and will contribute nothing to this paint, it very well could in fact eventually lead to failure. Back when I used lacquer primer I had nothing but problems with it mostly due to shrinkage weeks and sometimes even months after it was used. Lacquer has no place ANYWHERE in todays paint systems and can only cause trouble so why use it? It is so easy to sand off (That shows how "durable" it is ) that I just can't understand why anyone would leave it? If the epoxy is sprayed over this stuff then most of the advantages of using it in the first place will be lost so that is why I said earlier that it would just be wasting it to shoot it over the lacquer. If the lacquer is sanded off then the epoxy will be able to do what it is meant to do, adhere to the bare metal and seal it from the elements plus providing a tough foundation for the top coats. If it is sprayed over the lacquer it will not be able to come into contact with the metal and thus will be no better than the lacquer. The difference here between doing this right and doing what even the paint manufacturers will tell you is a mistake is taking that little bit of effort to sand that junk off!
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