1

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

1
  • Counter sunk screws are the normal way to attach a plate with the heads flush. This requires a bit that makes a tapered hole the screw head sits in like this with this kind of screw that one was for wood but there are ones for cement available at most home stores
    – Ed Beal
    Oct 24 '16 at 9:57
2

I would try a construction glue in a caulking-gun

enter image description here
Random example from Internet, any product with same characteristics will do

  • Waterproof: Can be used in interior or exterior applications
  • Versatile: For use on wood, metal, plastic, foam, mirror, concrete and brick

I've used a similar sort of adhesive to attach small plastic signs to rough granite, with mixed success. Some lessons -

  • You need the surfaces to be clean, dry and free from dust or loose debris.
  • If the back of the sign is very smooth, it might be worth experimenting with roughening it with sandpaper. This may depend on the specifiic adhesive.
  • When fixing signs on a vertical surface, I found it best to support the sign until the adhesive sets. I fabricated a temporary support using scrap wood and other materials.
2
  • +1 Just be sure the concrete is clean, dry, and any dust has been removed.
    – bib
    Oct 24 '16 at 12:12
  • @bib: good point thanks, I'll elaborate the answer a bit. Oct 24 '16 at 12:28

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.