If a light rain occurs more than an hour after sealing, then there should not be any issues. The color-enhancing sealers may turn white, but they will dry clear once the moisture escapes.  If a heavy rain occurs within a few hours of sealing, then some of the color-enhancing sealer may be washed off the surface since these sealers form a film on the surface.  In either scenario, the penetrating, AQUA-X sealers should not be affected.