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Polyurethane over acrylic sealer

Can I use spar urethane over acrylic sealer to make can more durable for outside use?

Hello and thanks for your question... Cheryl here with an answer.

I know that Spar Urethane is oil based. My concern would be that it would yellow over time. If the item will be outdoors seasonally, I'd suggest using a non-yellowing exterior varnish with UV protection.

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