OUR HYDROFLOW SEALER That's him. Our hydroflow sealer is an acrylic coating designed to work with our water based hydroflow. With the hydroflow sealer you can easily seal and protect the molds you have made. With the hydroflow satin sealer you achieve a gloss on your surface, while with the egg sealer you get a matt result. He can. After the hardening process of your mold, you can easily apply our hydroflow sealer and rub it on your surface with a damp cloth, brush or sponge. The hydroflow sealer has an eco-friendly acrylic formula and is made to be used with hydroflow or Aqua Cast. Particularities. • Easy to use with a spray bottle. • Eco-friendly acrylic formula. • Suitable for working with hydroflow. • Suitable for working with Aqua Cast.