How to patch rough surface around drain

[Innovate1]

I have a concrete floor with drain that the condensing furnace drains into. Over the years the condensate has etched away the concrete. I picked up some fittings that clamp to the drain grate and keep all the condensate in the drain and I want to fix up the floor before painting it.

I don't have much experience with concrete. What do I need to do?

First of course is fix the pipe so all the condensate stays in the drain.
Then neutralize the condensate residue on the concrete somehow?
What to fill the depression with? Mortar or concrete? It isn't very deep but has exposed some of the aggregate.
The how long to cure before masonry primer, paint, and sealer?

Related question is what to do to prep the other concrete? It is 15 years old and hasn't ever been sealed - it's in a basement so it hasn't seen road salt or much but foot traffic.

 

[Garage Flooring]

How deep does it go? How wide spread is it

 

[BillK]

picture ?

 

[Innovate1]

Here is a picture. The eteched away part isn't very deep. I intend to extend the pipe and fasten it to the grate so the condensate all goes into the drain.

 

[benwah]

I would use a product like Schonox to fill in the drain. They have many products so maybe giving them a call and speaking to a rep would be useful. You can trowel it smooth with a standard trowel or even a metal putty knife.

If you cannot find that stuff locally I would hit those hardware store and use whatever concrete patch material they have.

As far as surface preparation on the rest of the floor, what type of floor do you plan on doing? Are you going to seal it, stain it? Do epoxy, epoxy with flake or quartz? Once we have that answer we can advise on Surface preparation.

 

[Innovate1]

I would use a product like Schonox to fill in the drain. They have many products so maybe giving them a call and speaking to a rep would be useful. You can trowel it smooth with a standard trowel or even a metal putty knife.

If you cannot find that stuff locally I would hit those hardware store and use whatever concrete patch material they have.

As far as surface preparation on the rest of the floor, what type of floor do you plan on doing? Are you going to seal it, stain it? Do epoxy, epoxy with flake or quartz? Once we have that answer we can advise on Surface preparation.

My question on surface prep was really about what needs to be done to allow the patch material to adhere. I thought perhaps some baking soda in water to neutralize the acid from the condensate and a good flush with water and dry. But there could be better ways which is why I asked.

But the surface finish question is also a good one. The plan is to do epoxy paint - no flake. Any tips on prep for that would be appreciated.

 

[benwah]

I woulda abrade the area with a stiff bristle or wire bristle brush to remove any Loosely adhering concrete. And then vacuum it up with your shop vac.

As far as surface preparation goes I will always recommend grinding first. Unfortunately on thin film systems that do not have flake or quartz, grinding marks can Telegraph through the coating so you would have to be extra careful.

With some Coatings acid etching is acceptable, bear in mind it is the bare minimum as far as surface preparation goes. I don't personally use any types of Coatings like that so unfortunately I cannot give you a recommendation, but if you choose to grind then you have hundreds of products at your fingertips.

 

[Garage Flooring]

I woulda abrade the area with a stiff bristle or wire bristle brush to remove any Loosely adhering concrete. And then vacuum it up with your shop vac.

As far as surface preparation goes I will always recommend grinding first. Unfortunately on thin film systems that do not have flake or quartz, grinding marks can Telegraph through the coating so you would have to be extra careful.

With some Coatings acid etching is acceptable, bear in mind it is the bare minimum as far as surface preparation goes. I don't personally use any types of Coatings like that so unfortunately I cannot give you a recommendation, but if you choose to grind then you have hundreds of products at your fingertips.

THIS