Bleeding

Bleeding describes the penetration of colorants from a coating through the overlying layer, resulting in discoloration and uneven color tones. This phenomenon often occurs when water-soluble dyes or pigments migrate from the lower layer through the upper layer.

The cause of bleeding lies in the chemical composition of the dyes and solvents in the coating. If these solvents dissolve the colorants, they can reach the surface of the top layer through capillary forces. This happens particularly frequently with highly absorbent substrates or with insufficiently dried coatings.

To prevent bleeding, choosing the right primer and intermediate coats is crucial. These layers should have insulating properties to block the penetration of the colorants. In addition, special sealers and barrier primers can be used to create a barrier between coats.

Controlling drying conditions and ensuring adequate drying times between coats are also important to minimize the risk of bleeding. These measures can achieve an even and aesthetically pleasing coating that remains durable over time.