My husband used a white masonry sealer to paint both of my birdbaths..I would have rather left them the plain gray concrete. We spray painted them with Rustoleum stone texture and they were beautiful..UNTIL IT RAINED and washed it all off. Could the spray paint not be adhering to the masonry sealer? We have gotten some Valspar flat clear sealer for interior/exterior to seal the paint. It rained before we could use it. But I don't know if I want the expense of starting all over with the spray paint. It's very expensive. Can anybody tell me if this will work?