HO Scale Quarantined Buildings

[JLK2707]

I am just wondering how you can make an HO Scale Building look like it has been quarantined. Does anybody have any suggestions on how to do this?

[wjstix]

I think it's been a long time since you'd see a quarantined building, maybe the 1950's?? I don't know that there would be much external evidence except notices posted on all the doors.