Place surround mantel assembly against wall over the installed fire strips. Drill small holes in sides of mantel and legs to prevent splitting. Using small finishing nails, nail mantel surround along sides and at the top to secure to wall. If it is a stain or varnish, we recommend trying it out on an inconspicuous area of the surround so that it produces the desired finish. If staining, use a mixture of varnish and stain to avoid an uneven finish.
Some brands are available ready mixed.
Behr Products, Min Wax. Follow manufacturer's instructions.