First, thanks for the replies. I did some searching and found some tapes labeled for "Delicate Surface". I suspect these are a bit less tacky than the regular blue tape. I've used the blue tape successfully in the past, albeit not with these buildings, so I thought it should work. Clearly not with these. I do know about not relying on the tape edge as received. BTDT!
BTW, the walls are indeed resin castings. The window frames, which I will glue in near the end, appear to be styrene. They should hold paint well.
I'll pick up some gray primer. I'm not crazed about the idea of a non-plastic compatible paint, as I've seen what happens with some plastics. (Not pretty!) And since this kit is a mix of plastics, I have to watch out for what solvent they use in the paint. I'm not certain what will attack this resin. I know with styrene, keep acetone far away!
I'll probably remove the paint I have on already, as I don't want to obliterate all the details with multiple coats of paint. Since I'm dealing with freshly applied paint, I hope hot water, soap and a toothbrush will suffice. Then I'll give things a good amount of drying time before I try again.
Chris
LVHR