Jim, that structure looks great. Wish they had those when I was into trains back in the '60s. All we had were those real thick plastic ones that really didn't look all that great. There weren't many different ones either. Can't remember the name.
I used to use the Sandable Auto Primer that came in the large spray cans. If you put it on in light coats it worked very well and held up to any kind of masking tape. The price kept creeping up and then it was hard to get. Some of the guys on the forums say that they can't find it anywhere. My last source ran out last week and he doesn't know if/when he'll get any more. I started looking for a replacement last summer. Instead of looking for spray cans, I decided to look for regular cans of primer that could be thinned with water, figuring that it would cost a lot less for more (the cheapskate in me). Have been trying different makes with different additives (Dist. water/reg. water/different thinners) with limited success (the ex-lab tech. in me). If/when I find one, I'll be sure to let everyone know. I'm trying to stay away from lacquer based paints to make it easier to use on models.
From the looks of some of the equipment on your bench, I'll take a wild guess that you are/were a machinist by trade.
Jim