Re: Clear coating, a couple of questions...

Posted by Jerry B on November 12, 2002 at 09:19:45 from (205.204.242.23):

In Reply to: Clear coating, a couple of questions... posted by Karl Bader on November 11, 2002 at 03:56:36:

You can clear coat almost any paint. The only problem you have is whether or not the clear will lift the color coat.

When in doubt, most paintmen will wait until the color coat is dry and then spray the clear over it. This works BUT there is a problem doing it this way. The color will not be wet and sticky and therefore the clear may not adhere properly. Don't beleive me? Come and look at my 83 Plymouth that was painted professionaly using this wait and let it dry approach. It looks like a snake sheading it's skin.

The best approach is to determine EXACTLY the type of paint you are going to use. Most likely you are going to use an acrylic enamel if you use John Deere brand paint. Dupont has a clear designed for acrylic enamel but they recommend using a certain binder designed for enamel that is going to be clear coated.

If you go and talk to the Dupont rep, he can give you recomendations as to what your options are. I would be willing to say they are going to be limited to 7600s or 7500s clear.

If I were doing this, I would experiment a little. Try painting a scrap piece and then allow it to dry about 30-45 minutes. Spray a medium wet coat of clear. Let set for about 30 to 45 minutes to tack up good and spray the second coat. Let this dry 24 hours and see if this process works without lifting the color coat.

The idea here is to get good liquid adhesion without attacking the lower levels of color and causing them to turn loose from the primer. This is called lifting and is to be avoided at all costs.

Perhaps the best solution is to have the paint mixed at your paint supplier and tell him you are going to clear coat. He can adjust the formula as needed to accommodate the clear. The clear he will provide will be the best you can get for the base color you are using.

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