I have a number of large aluminium signs (4ft x 3ft) that I need to fix flush to pre-cast concrete slabs. Ideally I would like the fixings to be invisible rather than screw heads which will be visible and have been trying to source some kind of solution to no avail – Can anyone advise please?
Many thanks
Concrete – Fixing signage flush to concrete block
concrete
Related Solutions
You really should remove the stuff that was mixed overly wet - that tends to make cement products very weak. As a result, it should be easy to remove - might even come out with a stiff broom, if not, stiff wire brush might well do it.
Check the labelling on your paint - in most cases you should wait at least 30 days before painting (or attempting to paint) any fresh concrete product.
You need to attach the mount to the concrete, not the drywall.
There are special anchors for concrete. Most are made of metal and expand into the hole drilled in the concrete with a hammer drill and a masonry bit.
Most masonry anchors are sleeve anchors and use bolts (also called machine screws) to expand the anchor.
There are also metal lag shields that use lag bolts (heavy duty screws) to push outward on the hole and hold the device. These are fairly reliable, but are less forgiving if you need to remove and reinsert the bolt.
There are also masonry screws that can hold in concrete without a separate anchor, but these need precise drilling and care when tightening to prevent stripping the hole. While they are fine for things that use numerous attachment points, such as studs in a concrete floor or wall, the risk of failure on a device that only uses a few mounting points make these a bit more risky (in my view - contrary points of view welcome!).
The instructions packed with the mount often recommend which size of bolt or screw to use, and many come packed with mounting hardware for masonry attachment. Drill the size hole called for by the particular anchor, and take care to drill straight and not oversize the holes.
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Best Answer
I would try a construction glue in a caulking-gun
Random example from Internet, any product with same characteristics will do
I've used a similar sort of adhesive to attach small plastic signs to rough granite, with mixed success. Some lessons -