PolyUrethane Spray Protection?

I bought a can of polyurethane spray to use on my miniatures. My thought was that if, as I believe, the miracle dip process provided more protection, perhaps the same could be achieved on non-dipped figures by using spray urethane. I bought gloss, and plan to cover with my usual Dullcote to control the sheen. Has anybody tried this before? I'll follow up with a report after I try it. Update: Quick answer: Yes.