How can I seal my acrylic-painted terracotta pots without the paint smudging?

I paint terracotta pots with acrylic paint, leave them to dry and then attempt to seal them by painting on a varnish. But as soon as the varnish gets on the paint, the paint becomes wet again and runs or smudges. I've tried a couple of different varnishes but the same thing happens. Any suggestions? Do I... show more I paint terracotta pots with acrylic paint, leave them to dry and then attempt to seal them by painting on a varnish. But as soon as the varnish gets on the paint, the paint becomes wet again and runs or smudges. I've tried a couple of different varnishes but the same thing happens. Any suggestions? Do I have to use non-acrylic paints? Or is there an aerosol sealant I could try? Thank you!!!
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