I only use spray varnish on studies since I don't like Damar, and all the spray varnishes I've found seem to be made with it. Since it's only for studies I buy any old brand from the local craft store. When I'm doing a study I want to get it done quickly and don't want to wait for it to dry enough to oil it out with linseed.
For "real" paintings (not studies) I always wait until any given section is dry enough to oil it out. That seems to give me enough shine and an even finish so that I don't need to use any varnish. For the occasional piece that I do want to varnish I have used brush-on Gamblin Gamvar either full strength or thinned with Odorless Mineral Spirits, since it's not a Damar varnish.
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