My late husband built a number of Lego models that I would love to keep together. However having a 5 and 2 year old around this is proving difficult and parts keep getting knocked off. Is there any kind of spray glue type thing that I can use to hold the models together so they can stand up to curious little fingers. I know this not the best idea however I do not want them to end up in smithereens as I know they will never be remade again. I want to preserve the work my husband put into them.
Sorry for your loss.
I would hide them behind a locked glass door; even if you glue them, they won't likely survive a 2-year-old knocking them to the floor.
There is a product called Le-Glue (amazon link) which I've never used which bills itself as temporary glue (you can dissolve it with water).