I am in the process of varnishing LandSea07. I want a mat finish for the interior and gloss on the rest of it. Varnish should not be applied until the acrylic has had at least 48 hours to cure. I give it much more time. I have sprayed the polymer isolation coats and on top of that the removable gloss varnish. Soon I will mask everything but the rectangles representative of the interior and spray the removable matt varnish. The gloss and matte will work as representations of wet and dry... symbolic varnish.
The Smithsonian acrylic restoration web page is alarmist. They are dealing with the first acrylic paintings from the 1950's. Since then there are many new polymers like oven and microwave proof plastics. The "new acrylic", acrylic paintings have not yet begun to require restoration.
I first spray a clear, gloss polymer isolation coat of acrylic medium to protect the painting from absorption and from the eventual cleaning process.
I can't warranty the process for 500 years. I'm not as fool hardy as a computer printer photo colour cartridge manufacturer. But, I am pretty certain my acrylics will outlast contemporary oils (and most other acrylics). Restoration is, like many of our data bases, a trans-generational project. The restoration technicians I know were unaware of the removable varnishes that I use. It's an experiment. We are learning as we go.