Ok im doing a fiberglassed sealed box for two 12s. this is gunna be my first fiberglass build. im gonna have the bottom, back, and the sides mdf. the sides are gunna be rounded like if you was to cut a circle into four pieces they would look like one of those piece. the top and front are gunna be glassed. ok so im gunna have my two sub rings help up with strips of mdf. then im gunna sand the edges and stretch fleece and staple it all around and to the rings. then when i put the coat of resin with hardener on the fleece how long do i need to wait until i do teh first layers of glass?