How to do epoxy grout so the grout lines don't attract dirt and blacken then next day?
I did epoxy grout not long ago and the grout lines seemed to be fine and exactly color matched for a few hours until the very next day when most of it turned black or yellow due to it attracting dirt or moisture and I did not get the finish I was expecting. How to avoid it?
This time I want to make it right. I'm writing the procedure of what I'd be doing and would love some advice on it. The tiles are 2 ft x 4 ft.
Cleaning the grout lines and letting it dry completely.
Using a weighing scale to maintain the resin and hardener ratio. I'm using Kerakoll Fugalite color epoxy grout.
Completely locking the room and running an air purifier in it while grouting.
Using a rubber float to grout.
Maintaining two buckets of water. Bucket 1: 1 drop of transparent plant based dishwash soap in 500 ml normal temperature water. Bucket 2: Normal tap water.
After 15-20 minutes, once the grout feels only slightly tacky, using a nylon scrub pad to rub the grout joints in circular motion. Rinsing every 2-3 tiles. I'm making sure the nylon scrub pad is MOSTLY WRUNG before grouting. Or should I keep it slightly damp?
Immediately after, again using a well wrung sponge (from bucket 2) and diagonally cleaning the joints, refreshing the sponge with water every 2-3 tiles.
Cleaning with a dry microfiber cloth 2 hours later.
Will this procedure suffice to give me the desired clean grout lines? Any tips?