I use the best UV stable pigments that are mixed into the concrete. The color won't fade and remains colored if chipped. Made from Portland cement, silica fume, and distilled water. Cured 30 days and coated with solution of 40% Lithium Silicate, which is the best and most expensive sealer and densifier. It chemically reacts with the free lime and calcium in the concrete to form a permanent Calcium Silicate Hydrate structure within the pores. Giving it strength
and protection from efflorescence which is a discoloration caused by crystalline deposits of salts on concrete surfaces.
Some of my planters have many pinholes and some have none, pinholes can be cause by many things and they occur inherently when working with concrete. It is a detail that some people love and others don't prefer.