Hopefully someone is familiar with using Laticrete grout... have to regrout the face of my spa and the spillover to pool. Original grout on the rest of the pool started out as a blue but has faded to a medium grey, very slight hint of blue. Thinking of using Laticrete, one of two medium grey choices. Want to match the faded color but fear a good match now will fade out to something else later on. Hot Florida morning sun on it every day. Does Laticrete have any claims to fame on not fading or not fading much or does ALL grout fade over time? Any comments appreciated.