Hi guys, I'm at the final stages of my wooden balance bikes project (I had to make two for my twins).

I bought some "spar" varnish at Lowes for UV protection. Would normal polyurethane or Polycrylic work just as well or better? The bikes would, of course be used outside, but they would be stored in a garage, not outside. I want water protection (since they are bikes!). I don't want the wood to turn silver either, but I don't think they'll be outside for days on end in the sun either. Should I return the spar varnish and just use polyurethane/polycrylic?

The bikes are made with "hardwood" plywood. I think the other veneer is birch.

Thanks!

Vince