72 duster Build progress

Not sure about the chemistry of it all, but thats why I asked.. after a certian period of time, no matter what there is additional prep (like sanding again) and what you just posted bears that out.. so the answer to my original question would be 18 hours.. you have that long to shoot whatevers coming next, after 18 hours your sanding again.. lol. Did you already sand it after primering? Even if you did, I believe just a simple scuff is all thats necessary. (why, I couldnt tell you, but I have no doubt its a chemistry thing LOL)