Have you ever worked in construction? There are all kinds of hazardous materials that require you to wear a respirator or at least a breathing mask, and many of them are on sale to the public, albeit with stern warnings about safe methods for use. I see no reason that this product can't be used equally safely - that is, with a mask and proper ventilation. I have the impression from their datasheets that brushing is possible but spraying is preferable in order to obtain an even coating.<p>In any case, their primary target seems to be businesses that want to add value by adding a highly dirt-resistant finish to their products.