After many years of making a variety of stuff I'm finally learning about protecting my work.The 3d projects especially can collect a lot of dust which over time can damage projects. Flat surfaces are better with a layer of protection you can apply with a brush. On http://www.papiermache.co.uk/ (a fantastic source of information for those of you who also love papier mache) one of the artists experimented with different types of varnish and found that yacht varnish lasted the longest outdoors.
For 3d projects, like most of mine spray varnish is the best solution.
Unfortunately with a main road at the front of the house and a farm around the back so there's not much outside space to work on, unless I want to risk accidentally spray varnishing a curious duckling or something.
Researching types of varnish can get overwhelming if you don't know where to start. Finding a spray varnish that was preferably non toxic, gave UV and moisture protection was challenging. In the end Jacksons (the art supplies shop) gave some very helpful advice.
I've used their golden archival varnish. The smell wasn't too bad. I don't have much to compare it to and in some places it looks patchy. Not sure whether that's the varnish or me. Opening the lid was a bit of a nightmare. You have to insert a screwdriver or something to use as a lever. I broke the first lid and daren't put the second lid back on because it was so difficult to get on.
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