Have not seen Sandtex but there are some pretty good brands downstairs in the DIY shop, next to Citroen garage on road out to Antalya (some call it 'B&Q'). They have a really good range available. The paint that they mix on the machine is high quality external paint and is pretty close to Sandtex in terms of quality (years ago I used to be a store manager at the 'real' B&Q!).