This question was posed to me yesterday and when I started thinking about it I didn't exactly have a clear answer. Is it ok for professionals to apply "homeowner" materials like you can buy at Home Depot? Unless it's an RUP or there's something specific on the label forbidding it, homeowners can pretty much buy whatever we use if they wanted to. After looking at some labels of products online they don't say anything about not being used by professionals. I've never seen a list anywhere of products that can't be used by professionals. Is there a technicality that I'm missing? The only difference I could see in the labels is the WPS requirements but that wouldn't apply to me anyway.