I had scraped down a ceiling in the bathroom and bedroom in a house that was built in 1979. I was wondering,after I've already done it, if this stuff could contain asbestos? It has the little white styrofoam balls and came off quite easily. I am now concerned I could have put myself at risk if it was asbestos. The house was built by my grandpa in 1979, he had built 200+ homes. If anyone would know thatd be great. Thanks