Dogma...you can do it right after you apply it..but I wait like a hour if I have time and then apply a topper..reason is I let it completely air out any dryers on it before I use a topper....once and only once I had a problem doing a topper right away..but it was humid out..so it was not flashing off fast and the topper was smearing..so I wait if I can for it to flash all off and then top...if it is dry air you should be set right after...
Al
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