I am putting up a paste-up piece soon which is intended to be temporary - but I want to add some longetivity to it. It will be in a location which has high sun in the summer and also rain/snow in the winter.

I have read of people adding a varnish over the paste up (after drying) and also adding wood glue to the paste up mix. I'd love to know people's experiences with this and other mixes.

Currently I am experimenting with a stone varnish over the top of 80gsm paper, stuck down with a wheat mix on brick work. I'll update with results!