I had another PB over today to discuss replastering our pool (Quartzscape) and described the altered plaster application procedures and bicarb startup outlined by OnBalance. Right away he said the biggest problem would be that doing anything other than following Quartzscape's instructions would void the manufacturers warranty. But then he said the only thing the warranty covers is the finish completely coming off the wall and he's only seen that twice, ever, so maybe no big deal. I'd welcome thoughts about this. Is the bicarb startup worth giving up the warranty against an unlikely problem? Thanks.