wonder if you can help. my house walls were rendered tyrolean around 4 -5yrs ago but after it rains, isee sand thatis washed off, and after a recent heavy cloudburst 3days ago theres quit a bit of sand now, the guy who did it said said when it was done,that hed be back to put something on it, but never seen him again. just wondering if it was some water proof coating or smething.thanks
