Muhammad bin Ubaydullah bin Abi Rafi' (may Allah have mercy on him) narrates from his father, and he from his grandfather (may Allah be pleased with him), that the Prophet (peace and blessings be upon him) used to apply ithmid kohl while he (peace and blessings be upon him) was fasting.
Muhammad bin Ubaydullah bin Abi Rafi' is not strong.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8258