Sandtex Masonry filler 500g. This water resistant filler from Sandtex comes ready to use & is perfect for filling & repairing cracks & holes on external surfaces of your home. Simply apply with a spreader to brick render stone & most other building materials except common fletton brick & leave for 1 hour to dry. It's non-shrinking or cracking to ensure it has a longer life. It can be painted over once it's dried ideal for colour matching with your existing decor.