AK Modelling Putty White is a ready-to-use, one-component filler for correcting seams and surface imperfections before sanding. This is the high-hardness grade in the tube-putty family, clearly distinct from the standard-hardness grey version. Its superfine consistency is intended for modelling work where the repaired area will be levelled and sanded back. The water-based polyurethane formulation dries without shrinkage, and no separate hardener or mixing step is involved. AK identifies this as the high-hardness white grade. The tube contains 20 ml, with a stated net weight of 39 g. AK describes the filler as superfine, with adhesion and sanding properties. The water-based formulation can be cleaned off with water, and AK states that being water based means no smelly chemicals in the mix. AK publishes no drying time or sanding-ready time for this product.