Hello I put 3 large sheets of GrypRock sheets(250high x120longx1cm) to cover a internal brick wall, I used cement adhesive to join these on to the wall. The bricks had a thin coat of acrylic paint on them, so I sand down about 10cm circles every 30cm sq and applied the adhesive on top on this. My question is, will the glue alone hold it in fine or do I need to have nails in there too? thank you
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