Tetrion All Purpose Filler is the same tried and trusted formulation which has been the go to for trade decorators and DIY enthusiasts for over 40 years. Tetrion All Purpose Filler is still the ideal choice for projects where a versatile, multi surface filler is required. Specially designed to give a super smooth, polymer re-enforced, permanent finish. Tetrion All Purpose Filler can be used for both indoor and outdoor applications.