Move the RV to an outdoor area. Locate the damaged area. Wear safety glasses. Put on gloves if working with a gray or black water tank. Use a cordless drill to drill a hole at each end of the crack to prevent it from becoming larger. Drill while the tank is full to prevent shattering the tank. Discard gloves.
Empty the tank. Gray and black water tanks must be emptied at a disposal station. Use the appropriate hose kit to empty the tank.
Use sandpaper to rough up the damaged area. Clean the area with acetone to remove all debris. Wipe dry with a rag.
Cut a piece of fiberglass cloth that extends past the damaged area by at least one inch in all directions. Fiberglass cloth can be cut with scissors.
Put on gloves. Open the Seal-N-Place kit and remove the resin bag containing a metal tube. Keep the bag sealed and break off the tip of the tube. Turn the key at the end of the tube to completely empty the contents into the resin bag.
Squish or knead the bag until the contents are combined well. It takes a few seconds for this to occur. From this point on, work fast--you only have six minutes before the resin hardens.
Use a craft brush to completely cover the damaged area with the resin mixture. Extend the application of resin one inch past the damage on all sides.
Place the fiberglass cloth over the resin and smooth down with a gloved hand to remove all creases and bubbles. Coat the entire piece of fiberglass cloth with resin, holding it in place with one hand and painting with the other. Smooth the edges of the cloth for a neat finish. Allow to dry.
