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In respect to this, should you varnish an acrylic painting?
It is essential that you varnish your completed acrylic paintings. The varnish will protect the painting from dust, UV rays and yellowing. I usually stick with gloss varnish because I love the look of a glossy finish, but you may have your own preference.
can you put gloss varnish over matte varnish?
If you spray a gloss coat and then cover it up with a matte varnish you will be able to see shiny spots develop if the matte varnish starts to wear off. If this happens you could wash the model and apply another coat of matte varnish.
Yes,you can mix various colors of nail polish to create a custom color, and you can mix water based acrylic paints for that custom color and then apply it on top of a nail polish base coat and top it with a good top coat to seal it in.