What sealer's are generally used for either paper maché or for clay surfaces? And are they available in Canada? Thank you!

I usually glue paper strips over my moulds with a diluted PVA (wood worker's White Glue) solution. This is an extremely quick and simple water proofing method which does not require a final sealant.

One traditional sealant is Shellac (naturally-occuring yellowish orange flakes of a resin "lac" which are secreted by a tropical beetle and then dissolved in alcohol). The disadvantages of shellac are its long drying time ... and the smell (which takes a very long time to dissipate). Varnish can also be used, but it has the same disadvantages as shellac.

The modern approach is to use a clear, non-yellowing, acrylic sealer spray which should be available at most craft stores.

Edit
A useful comparison between varnish and PVA sealing can be found here: http://www.papiermache.co.uk/articles/waterproofing-papier-mache/2/

Regards,
Dorian

Awesome, this will help a lot. I will have to buy loads of glue as I will surely need it for my marionettes. The fact that I am working in my basement with little ventilation, it is a good thing to go towards that avenue instead of the toxic ones such as lac or varnish products.

Great help Dorian, many thanks and much puppet hugs.