The adhesion of several washcoats deposited on stainless steel microchannels was investigated by performing a mechanical test (drop test) after application-oriented tests, temperature cycling, and water exposure. For this study alumina washcoats (gamma-Al2O3) and washcoats of commercially available alumina-based catalyst powders (Pt/Al2O3, Rh/Al2O3) were used. The deposited washcoats showed very good adhesion not only for fresh samples but also after the application-oriented tests.