Hey Richard,
Even with a fiberglass wall you would still have some studs that you can shoot some mounting screws through to fully secure the tv mount # MR28ZR and tv. You can pick up a stud finder from your local hardware store and use it to find a stud in the wall and plan where to place the tv. You'll want to place some butyl tape # AL28FJ on the back of the bracket to help prevent water from leaking in through the screw holes. You can also go over the screw heads with some sealant #... view full answer...
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