I am buying coloured silicone renders for 45 quid a 15ltr tub
if sandtex is 16 quid a 5ltr tub then multiply by 3 and add your grain you are up to 54 quid plus you are mixing it youself and can offer no insurance backed guarantee for your system.
Sandtex = £16.00 for 5 litres.
Grain = £0.22p per kilo X 5 kilos = £1.10p
total yeild = 10 litres for £17.10p
is it silicone based and does it have the stay clean pigment also?
Dont know what the stay clean pigment is i have been adding different pigments to plasters and renders for quite some time and have never heard of this. It does however contain a chemical which is both anti-fungicidal and anti-algae so will not inhabit any bacterial growth, as for dirt and grime from weather and traffic i dont think anyone can guarantee this will not happen.
But yes there is no guarantee, sandtex put 25 year guarantee on their masonary paint but because it will be modified this will be void.
This is not my system i just wanted to break the material down and make my own, i didnt set out to make a cheap alternative just to understand the product more.