You should never apply a standard concrete sealer, water repellent, or curing compound immediately before pouring self-leveling concrete, because sealers are specifically engineered to block moisture absorption and prevent bonding. Instead of a surface sealer, you must apply a specialized, manufacturer-approved acrylic primer or bonding agent designed for self-leveling underlayments. This specialized primer penetrates the open pores of the concrete, seals excessive suction to prevent pinholes, and establishes a powerful adhesive bridge required to keep the self-leveling compound securely bonded to the subfloor without delaminating over time.
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