Thanks Korm. Thanks Rooster. I think an answer is beginning to take shape.
I like the thought of easy-peel-off electrical tape. Its adhesive isn’t as gummy as duct tape, and the pro grades say they seal well. It doesn’t tear easily, while removing it. And I like the option of spraying the box black, if needed. So I got some pro quality electrical tape, and will use that on the seams. Then, if the halo effect is noticeable, I’ll shoot the box with black Fusion. That way, when I peel the tape back off and replace it, there’ll be clean plex substrate to adhere to.
Will try it out over the weekend…
About paint. I came to the sad realization that you can’t get those little sample paint colors (from Sherwin Williams, Behr, Ben Moore…) in specifically exterior grade. They’re only to test color, not to be the final thing (at least outdoors). So I’m ordering quarts (smallest I can find!) in certain colors from Home Depot, and they’ll deliver for free (for over $45).
The good news is that I received great info on Virginia City building paint colors from some historically-savvy friends out west (Mike Collins, Dan Ball, Andrew Brandon). They pointed me to an official document (“Comstock Historic District Construction Standards”) that says what colors you can use in Virginia City today: basically anything in the “Historical Color Collection” by Benjamin Moore or the “Heritage Colors” by Sherwin Williams is fine. The web sites of those companies have palettes, and it was easy enough to pick out similar colors in Behr Premium Plus exterior latex, on Home Depot’s site.
And now, a sideline for we who are historically anal about such things. Theoretically, one could try to go further into historical accuracy on this, and which actual color / formulation was used. But then you’d run into which era and which substrate of a particular building; then, archaeologically uncover actual fragments of paint, and have it analyzed and color-corrected for degradation from age or other effects. That’s what is being painstakingly done for, say, the V&T’s first Mound House depot which is currently under restoration (in Dayton). But for hobby purposes, and for Virginia City in general, it’s a level of information which is impossible to acquire. And fortunately, I really don’t care.
Bottom line, I’m really relieved that the buildings don’t need to be all whitewashed!! And I’m looking forward to painting them with a good breadth of historically permissible color. I suck at painting, but I’m glad to finally have a plan.
===:>Cliffy
PS, a friend (Andrew Brandon) gave me this excellent link on historical paint and color choices, per time frame:
http://www.pacificng.com/template.php?page=/ref/color/index.php&pg=refbooks