I wouldn't be so bold as to tell you what to use especially since you are varnishing over Liquitex paint, which I abandoned early on due to certain problematic experiences I had.
I would call Golden and ask them about which varnish was slower drying or if there was a paticullar reccommendation regarding the application to avoid visable brush strokes. They are a very responsive company and nurture their relationship with their customers.
It's important to test out any new product before applying to a critical situation. I wouldn't take anyone's word without verifying it myself. Everyone has different ideas about what works for them. As Paul Simon so aptly put it, "One man's ceiling is another man's floor."
I personally don't like when paintings appear too glossy. However, a totally mat varnish can deaden a painting. So I mix some matting agent into the gloss varnish to give me a slightly matted gloss.
I'm sure either of Golden's varnishes would be easily removable and wouldn't damage a high quality acrylic paint film. Again, testing on a similar painting would be advised.
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