I would get a small can of great stuff and try to fill the hole with that to give it a good solid back.
How to fix hole in wood panel wall.
When the great stuff was done.
Press a damp cloth over the scratched area of the panel.
Tip if you are having trouble getting the wall patch to stick try wetting it slightly with a wet sponge or a using a spray bottle filled with water.
If the hole is only 6 wide a small piece of 2x4 or even 1x2 and a plywood patch will probably cover you.
A pry bar or screwdriver will work.
You should lay the craft sticks on the side they won t be seen from.
Measure the size of the defect in your project and add a little extra around it.
Loosen the panel by lifting it from the bottom edge.
How to patch wall paneling.
Use a utility knife to score an outline of the patch on the paneling surface.
How to patch a hole in wood paneling step 1.
Smooth the edges of the patch around the hole.
Apply the sticky side of the wall hole patch around the edges of the hole leaving at least a on each side of the hole.
Be sure to use a large enough piece so that you can clamp this piece to the wood you want to work with and have enough room for the plunge router to move freely in the template.
Place the glue around the border of the hole in your wood.
Remove the wood moulding from the sides top and bottom of the damaged panel.
Check the panel to see if the steam has raised the wood fibers you.
Pull nails along the seams and edges.
Cover the hole or dent with fast drying spackle to bring the spackle level with the drywall surface and let it dry 24 hours or the time recommended by the manufacturer s instructions.
Take a utility knife and clean up the splinters on the edges.
Hold a hot steam iron against the damp cloth for about 30 seconds.
Place the craft sticks on the back of the hole and secure them with wood glue.
Cut the panel out.
Center the piece over the hole lining up grooves on the patch and paneling.
Cut some lumber to span the opening and attach it using screws through existing plywood around the opening.
To seal the seams between your patch and existing plywood use wood filler.
Cut a piece of panel slightly larger than the hole or gouge.
If you re filling a hole in a cabinet wall or a wardrobe place the craft sticks on the inside of the hole.
Scrape away loose debris from the hole.