Hi. What's the best way to make fixings into hollow bricks (the ones like air bricks)? I have a couple of wall brackets to put up to hold guitars - so not a huge weight but not something I would like to see fail. Some people suggest drilling then filling the hole with gripfill, putting in a wall plug, waiting for it to dry, then screwing in like normal. Does that work? Or is there a better method?
Ta!
Ta!