Polycrylic over cured polycrylic??

[Will Kalkhoff]

I am working on a memorial flag project for a deceased police officer. I have finished the flag, and I sprayed on four light coats of semi-gloss polycrylic today. It turned out nice. My next step was to apply a vinyl sticker in the lower right portion of the flag, which is a picture of the officer and his department's patch on a transparent background. The problem is, there is an unexpected delay in shipping, and I am not going to receive the sticker today anymore. In fact, it might not arrive until September 10th, which is six days from now. By then the polycrylic I applied today will have completely cured. My question is this: Once I get the sticker and affix it to the flag, can I then spray on three more additional layers of polycrylic to seal the sticker? Is there any issue with spraying additional layers of polycrylic on top of lower layers that will have completely dried and cured by then? Thanks!

[Jim Becker]

Just lightly abrade the cured finish (as you must with anything that contains polyurethane...) to give some "tooth" and shoot the last three coats when the time is right. And I do not mean heavy sanding...just give it a rub down with 320 or 400, clean it thoroughly and then continue with the additional finish.

[Will Kalkhoff]

Thank you!