The invention relates to a method of coating a core (1) for manufacturing a part (2) for a turbomachine by isostatic compaction, for example a blade leading edge shield, the coating method comprising the steps of: - S1: Coating of the core (1) by means of a first solution comprising a first refractory component configured to oppose the diffusion of the species, the first component comprising a metal oxide, - S2: Coating of the core (1) by means of a second solution comprising a second component configured to bond the first component so as to form a homogeneous layer, the second component comprising an inorganic binder; - S3: Application of a heat treatment to the coated core (1) so as to dry the solution and solidify the coating.
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