If you really feel anything at all then crack up the clumps and see If your mass mixes again in with the final regularity from the stain. If it dissolves into the stain you can use it. If it remains lumpy the stain has separated and it's no good. On https://travialist.com/story9244033/indicators-on-can-i-stain-deck-before-rain-behr-you-should-know