The invention provides a spray applicator (1) for topical treatment, the spray applicator (1) comprising a container (2) comprising a treatment liquid (52) under pressure and a propellant (51), wherein the container (2) is in fluid connection with a spray valve system (4) for application of at least part of the treatment liquid (52) on a topical area, wherein the treatment liquid (52) comprises an acid, wherein the container (2) comprises a container wall (20) having a top layer (22) and a top layer coating (21) on said top layer (22), wherein the top layer (22) comprises a metal and wherein the top layer coating (21) comprises a polymer.
