I've completed the little Japanese Chin dog and have been working on finishing it for glassless framing. I used the PVA glue method for the pastel layers and that worked well, I've never had a problem using diluted PVA.
However, I have had problems with the final varnish coats this time. I'm using Golden's UV Gloss Varnish for the final, protective coats and have gotten tiny little bubbles. Golden says to watch for these (and also foam) when applying with a brush but it doesn't say how to get rid of them if you get them!
So, I've had to let the portrait dry completely then I've used a very fine sandpaper to sand out the bubbles then I've used ammonia to smooth and even out any marks that were left. I don't know if this i the correct way to handle the bubbles but it seems to have worked for me. If anyone knows of a better way, please let me know!
BTW, if you use ammonia in any way, please open a window or make sure there is plenty of ventilation and don't expose yourself to it for more than a few seconds at a time! Ammonia can do great damage to lungs!
I want to add that I tried brushing on the varnish this time and do not recommend doing that at all. You get a much nicer finish if you spray on the varnish.
It's been frustrating for me but I hope my experience helps someone else in the future!