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Hi Tommy, I would suggest being a little careful with the recoating of unhardened enamels. You may not be able to generalize. The tech sheets for some paints indicate a safe recoat period and some do not. For instance, PPG does not recommend recoating their unhardened OMNI MAE without risking lifting. Below is my question to PPG tech service on that issue a while back, together with their answer: Comment/Problem Description:
What is the safe recoat period for OMNI MAE acrylic enamel (w/o hardener)?
There is nothing to indicate any recoat sensitive period in the tech
sheet. It used to be that uncatalyzed enamels were sensitive to lifting
upon recoating after a short dry time and before full curing perhaps
months later. I have noticed that DuPont's NASON FastDry acrylic enamel
(uncatalyzed) indicates recoating after 48 hours. Can MAE (w/o hardener)
be similarly recoated without danger of lifting?
Thanks,
Rod Thompson
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Rodney, Thank you for your interest in PPG products. There is no safe recoat period for uncatalyzed MAE. We do not have any recommendations for recoating uncatalyzed MAE. The best recommendation would be to put a waterborne primer over the uncatalyzed MAE and then recoat with MAE, still there is no guarantee it will not lift. If further assistance is required, please contact us at the Technical Service number listed below. We have established an automated faxing system that allows you to fax
yourself product bulletins 24 hours a day. The PPG FaxBack number
is 800-450-2654. If you order document number 24747 from our FaxBack system, this document provides the instructions on how to use the system and the indexes that are available. PPG Technical Service office is open Monday - Friday, 8:00-6:00 EST. This office can be reached at 440-572-6111 or FAX 440-572-6772. The
E-mail address is - reftechserv@PPG.com. You can also find us on the web at www.ppgrefinish.com Before using any PPG Refinish products, be sure you understand the
warning messages on the labels of all components, since the mixture
will have the hazards of all it's parts. Spray equipment must be
handled with due care and in accordance with manufacturer's
recommendations. Spraying of any material can be hazardous. PPG
recommends the use of a fresh air supplied respirator with the use of
any of our products. PPG REFINISH MATERIALS ARE DESIGNED FOR
APPLICATION BY PROFESSIONAL, TRAINED PERSONNEL USING PROPER EQUIPMENT
UNDER CONTROLLED CONDITIONS, AND IS NOT INTENDED FOR SALE TO THE
GENERAL PUBLIC. Technical Service/LS
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