Ok guys, writing back to report the outcome. The paint manufacturer stated that it dries in 16 hours, i left it for six days - it is definately dry and even gently rubbing it with a q-tip doesn't leave any residue on the q-tip.
Spent all Thursday morning firing the shutter at different speeds - the blinds remained light tight and no cracking/banding/capping/dragging or any other horrible shutter deseases noticed.
Transfered the half-finished roll from the OM-2n to the IIc to take a few test pics. Everything seems fine. Here is a sample: Elmar 50f/3.5 at f/8 1/500. Film is a Delta400 in HC110 (1:50).
Postscript: Boy, this Elmar can be such a sharp lens. Here is a crop from the above picture, you can count my daughter's eyelashes in that picture...