Temporary sign on unsealed concrete

[rfulford]

I have to hang a temporary PVC sign on an unsealed concrete wall. It will be wave graphic roughly 96"x12" 6mm thick with a smaller 6mm standoff in the back. I am thinking of using a silicone adhesive but I am worried about discoloration to the wall when we strike the graphics. Any thoughts?

 

[Moze]

VHB tape if it's on an interior wall or wall that doesn't see a lot of temperature fluctuations. And yes, silicone will leave dark spots.

 

[rfulford]

Thanks Moze.