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Okay, so I've just started on my third attempt at papier mache that, hopefully, this time will be successful. But, when I'm done, I'm not sure what to seal it with. I did a project for school this year (a grade 8 entreprenuership thing) and I made papier mache beads. I sealed it with Marine Spar Urethane because it was the only thing I could find, but not only did it make me really sick and take forever to dry, but the smell didn't go away. I know it was a stupid idea but it's all I had! Now this time I searched my house high and low again and I found this interior acrylic varnishy stuff, and it doesn't smell as bad at all, but it sais it's for wood. Is it okay to use that? I just would really rather not spend money if I can use it. Does PVA glue or nailpolish work just as well? I want it to last for a long time. Also, if you know (and I know it's unrelated), but can you use the interior acrylic varnish/nailpolish/PVA glue on salt dough sculptures? K, well, thanks!
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You can seal with a number of things, although for waterproofing sadly Marine/Yacht varnish is the only thing that seems to work.
Have a look at Jackie's Tutorial on waterproofing papiermache as she experimented with most varnishes.
One thing I have never tried is wax or sanding sealer. As a good rule of thumb though I would say if the product is formulated for wood then it should work for Papiermache, most paperpulp being wood fibre (although some is rag, I have found that this is not so good for pm).
If your piece is going to be indoors then I would experiment. I have finished a piece with tissue paper, watercolour paints and then sealed it with artist's watercolour varnish, this was for a fine decorative box that would only be dusted.
Best of luck,
Charlotte
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