Our ceramic tile sewing pens contain amorphous silicon, aluminum hydroxide. It can protect the gap between the tiles, make it bright as new, after application can be exposed to water for 60 minutes, waterproof, anti-fouling, do not fade. Its use method is very simple: clean and dry the base surface, before kneading ink, after painting along the gap, do not dip in water, wait for about 1 hour to dry. And long-lasting results are guaranteed.