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Water proofing conrete in DRC
Same mission wants to know how to make concrete waterproof. We used to use Skialite poder for the skimming inside water tanks in Rwanda - info on this says it can be used for concrete as well.
What was your experience or do we have any members in Lubumbashi? That is where he is based. Sikalite may not be available there.
I suspect he would be better off walking into a friendly construction company's site office and asking there.....