Re: How to Patch a large hole in Masonite/Fiberboard walls?
You should be able to repair problem areas using standard drywall techniques, and that would be to cut out the damaged section, surround the patch with reinforcement material, and cut a new patch to fit. From there you can tape and float out the patch to match the rest of the wall. The reinforcement material is little more than 1x2 or larger scraps of wood that are screwed around the perimeter of the patch that not only support all sided of the existing hole, but also support all sides of the patch filler.
Use hollow wall anchors when hanging light items. Attach directly to studs if hanging heavy items. Hollow wall anchors collapse on themselves (acting similar to a toggle bolt, only better ), providing a firm attachment to the wall material. Your only limitation will be the strength of the wall material to resist the weight of the item you're hanging.
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