Archival of course its not actually blue any more its white and it doesn't leave any marks on the wall

.
Roboframer in answer to your question what is the difference between a hotel wall and the wall of a private house the answer is non, apart from the fact the walls in a private house will not have wet paint on them when the pictures are hung. It has everything to do with time and budget. Items for a hotel are a budget item which I may only get a few days to frame 150 pieces. In any refurb job pictures are the last thing to go in and most of the time the budget has been used up elsewhere and quite frankly the designer hasn't given the pictures much thought. As a result orders are not placed till the last minute which gives you precious little time once materials and prints are ordered to actually frame up the job. On average I will get about a weeks notice from receiving purchase order to when they have to be delivered.
Last week I had a job for a Thai restaurant which I have known about fora few weeks but had no details of what was being framed, what it was going in and how many pieces. It turned out they were all objects to be box framed, which the boxes had to manufactured out of MDF jointed glued and painted, but the objects didn't start arriving until Tuesday, some didn't arrive until Friday lunch time but the whole job was completed by close of play Friday.
With regards to what would happen with an order of 200 large frames well then yes they would be glued, but then I would be charging more. The reality of hotels is that pictures going in bedrooms are cheap and cheerful those in public areas ie reception, bar areas and restaurants, the budget is usually greater and they want wood mouldings with bigger more elaborate mounts, and I would get more time to do a smaller number of frames.
A job for a private client is totally different and would be framed to a higher standard.
These are the constraints that we have to work under in the leisure and hospitality sector and perhaps Robo if you regularly did this type of work then perhaps you may understand.
If any one else from the bespoke sector feels the need to have ago at me please feel free I believe it is International Bash a Contract Framer Week so please get them in.
Thank you.