I need to know how to prepare brick for outside painting please. Also, do you have silver colour masonry paint?
Assuming the brick is clean, dry, sound and prepared as detailed in the technical data sheet we can recommend Zinsser AllWeather Exterior Masonry Paint (Solvent Based).
This can be mixed to many RAL and BS colours including RAL 7001 Silver Grey.
This can be applied directly to clean, sound brickwork.