Polyurethane’s durability is what gives it an edge against polycrylic and makes it better for exterior use. Water-based finishes that soak into the wood (such as polycrylic) don’t offer much in the way of protection against scratches or buffs due to how little of the finish remains on the surface. As an oil-based lacquer, polyurethane stays mostly on top of the surfaces you apply it to and leaves a much more durable topcoat. While polycrylic is a better option for use inside the home, it won’t give your surfaces much protection. Without a thick topcoat and with its thinner consistency, surfaces coated with polycrylic are more prone to being damaged by scratches and scrapes. Polycrylic also doesn’t resist moisture or heat as well as polyurethane, as the water-based formula isn’t suited for use in these conditions. Polyurethane, on the other hand, is much more resistant to heat and moisture, which is what makes it the better choice for outdoor use and for surfaces that will have more heavy-duty handling. That said, polycrylic is still a better choice for surfaces such as counters, cabinets, and furniture that will only be subjected to light handling. While it might not offer as much protection as polyurethane, polycrylic will still add some defense to your wood and help keep it safe from minor damage.