Testors spray paints are a enamel and with enamel paints they are slow drying and dry from the top down and the process is very slow. Laquer's are what they call "Hot" paints because they dry very fast (From the bottom up). So if you spray a laquer over an enamel that isn't fully dry you will get a "aligator" finish. It also depends on the conditions that you spray the enamel in also. I live near the water so it usually humid where I am and when that moister is present it slows the drying process even more, that's why I wait a week with it. Just to be safe.