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Just wanted to do some home repairs and found lots of old drilled holes.

I've used putty to cover them up but it occurred to me that there would be air gaps for the holes as the putty cover over them only.

I went searching around online and there has been no definite answer.

I've saw selleys no more gap and was wondering if it was a good choice to push this sealant into the concrete or perhaps those adhesives sold in a caulking gun would be a good choice.

I am afraid that next time i'll re-drill the holes at the same place and it would crumble.

I've saw this question but from where I am, they do not sell them.

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We have a few small holes left from insect treatments, we had to have a structural engineer approve the house for insurance because of other things around the house and asked him about them. We followed his advice and filled them with concrete colored 100% silicone "caulk" –  Jason Jan 7 at 15:40
    
I suppose it depends on what the concrete is used for (exterior, interior, walls, slab, wall, column, etc.). What about epoxy? –  Nick Jan 7 at 16:52
    
@Nick the concrete is an interior wall. –  steve0hh Jan 8 at 14:40

1 Answer 1

up vote 3 down vote accepted

Hydraulic cement would be a reasonable choice for patching small holes in concrete - since that's what it's made for. Be sure to wet the hole first, then pack in the cement and level it off.

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hmm.. then how do we ensure that there are no air gaps? I'll accept your answer in 2 days time. –  steve0hh Jan 9 at 10:13
    
You can use various techniques to improve the packing - something like a nail about half the diameter of the hole, with the point ground off flat can be used to pack the cement in the the hole - it can't be too close to the size of the hole, or it becomes a piston. A very small tube or straw could also be placed into the hole to allow air to leave as the cement in pushed in, and withrawn after cement reaches the back, but I think you'll find that lovely in theory, but far too much bother to actually do in real life. –  Ecnerwal Jan 12 at 16:18

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