minimum wait time to apply urethane over epoxy

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Just wondering what the minimun wait time is that I can apply 2k urethane over epoxy primer. ? I prefer blocking urethane so I always top my epoxy with 2k. I know I have up to 7 days to apply it without sanding, but just trying to get an idea of the pros/cons of applying sooner or later if there are any.. I normally wait at least 24 hrs before I apply the 2k as long as I have been able to keep the heat up for the epoxy to set. Thanks as always for the advice/ tips.
 
Problem with rushing epoxy is the results of a disaster will not normally show up right away.
If the car is worth anything at least let set overnight.
Other then that, 70 degrees, 2-4 hours can work, if temps are perfect.
 
Thanks barry, I usually always wait 24 hours before applying urethane but didn't know if I should wait longer, or if I'm able to keep the temps up the entire day I'm at the shop if I could apply the urethane before I left that night. The pieces I'm doing right now are just 3 small motorcycle tins for a vintage benelli bike. I pre heated the booth then epoxied them, heated booth up again beetween coats, then had them under a heat lamp for 6 hours, metal temps were around 135, I brought them home with me and have had them inside all night under the heat vent haha. Was hoping I could head to the shop real quick and urethane them before I left for the fire station at 11a.m so I could possibly paint them tomorrow.
 
heating like that, once it cooled down you are ready to go.
Really would be safe with an hour of heat like that after cool down.
 
heating like that, once it cooled down you are ready to go.
Really would be safe with an hour of heat like that after cool down.
 
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