A tool used to produce the hull of the Vapor Optimist racing boat is prepared for production and a channel is routered into the tool that will aid in providing an airtight seal between the tool and the vacuum bag. Next, mix and vacuum the EZ~Brush® Vac Bag Silicone and pour it over the profile. Apply three layers of EZ~Brush® silicone to all surfaces, forming a continuous rubber vacuum bag. Allow all layers to cure. The bag is strong, durable and dimensionally stable.