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Unfortunately, once concrete has been rain-damaged during placement and curing @mzaaroura, the surface laitance that forms is inherently weak. That powdery layer doesn’t really have any structural integrity left to “lock in”, which makes this a difficult problem to solve without some form of surface removal.
I’m not aware of any readily available retail products that can truly solidify and restore a badly dusting surface without first removing or mechanically keying that weak top layer. While there are concrete sealers and surface coatings available that can temporarily bind the dust and reduce surface shedding, they won’t improve the strength of the concrete itself. In many cases the dusting can continue underneath the sealer, eventually leading to peeling, flaking, or ongoing deterioration.
There are trade-level densifiers and hardeners used by professionals that can penetrate concrete and improve surface hardness, but even these generally require the loose material to be removed first so they can bond to sound concrete. Without that preparation, results are unpredictable.
If you want a long-term, durable, dust-free finish, the most reliable solution is usually to have the surface mechanically prepared, such as light grinding or honing, and then treated with an appropriate densifier or coating. A concrete specialist would be best placed to assess how deep the damage goes and recommend the right system to stabilise and rectify the slab properly.
If you’re after a short-term improvement, you could try a standard penetrating concrete sealer to reduce dusting, but it’s important to go in knowing it may only be a temporary fix rather than a permanent solution.
Please let me know if you have any questions.
Mitchell
