Henri
refuses to grow up

On my prevous layout I used Rowlands mix. But due to time restrictions (gotta work sometimes) I ended up making several different batches. And after applying it was really obvious they were different. Structure wise and moss growth wise.
One part was actually destroyed by frost, all came loose and washed away.
One part obviously had too much cement as it became rock solid.
One part was pretty ok (whaa, succes!)
After all was settled and dry after a few weeks, I applied yoghurt, later on beer, and finally a mix of yoghurt, sugar and moss snippers. With various succes, but the last mix had most succes.
Now the question: almost all different batches turned light gray within weeks. Cement gray. Also the grit I used had a gray look. Can this be avoided?

Freshly applied. Looks the bomb!

Catching on great! But was ruined by frost...

The rock-solid area. And gray, very gray.

A part that did catch on very well...

New applied...

Getting there...
One part was actually destroyed by frost, all came loose and washed away.
One part obviously had too much cement as it became rock solid.
One part was pretty ok (whaa, succes!)
After all was settled and dry after a few weeks, I applied yoghurt, later on beer, and finally a mix of yoghurt, sugar and moss snippers. With various succes, but the last mix had most succes.
Now the question: almost all different batches turned light gray within weeks. Cement gray. Also the grit I used had a gray look. Can this be avoided?

Freshly applied. Looks the bomb!

Catching on great! But was ruined by frost...

The rock-solid area. And gray, very gray.

A part that did catch on very well...

New applied...

Getting there...