Fully painted sealant joints tend to crack with joint movements since the paint applied accommodates less expansion than the sealant underneath. DIN 18540 states that “Joint sealants should not be painted over.” In practice, acrylates and SMP sealants are painted over, but silicone sealants are not. If you wish to paint over the sealant, the sealant should first be tested according to DIN 52452-4/A3.