Chico,

Here is a link to the MSDS for Ultra 7000. For most paints, this can be used as a guide to what is compatible to be used as a thinner by what is listed as already being in it.

http://www.sherwin-automotive.com/media/msds/English/1011.pdf

For example, the first ingredient in the mix is Mineral Spirits. Although it only makes up a small percentage of the base, it is a safe bet you can use it to thin this type of paint and make it spray better.

Another indication is what the supplier recommends to use for cleanup.

So keeping that in mind and going back to the MSDS, it shows Mineral Spirits as an ingredient in the base coat but not in the clear coat Ultra 7000. So you wouldn't use Mineral Spirits to thin it. In fact, using Mineral Spirits in the clear coat may really mess it up.

Conversely, using Methyl Ethyl Keytone in the base to thin it may give bad results. Using it as a thiner in the clear would be ok.

1949 "Heinz 57"