Hi Susan--
You haven't said if you're finished with the painting yet or not...? but if it's ready for varnishing, Golden's makes an archival spray varnish in either a gloss, satin, or matte finish. When I want a matte finish on a painting. I use their satin spray and it turns out quite nicely. I haven't tried their 'matte'... but the satin seems pretty 'matte' to me without being 'flat' and gives a nice even finish.
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