We got an update from Preis, the glue in question is based on 2 components that are to be mixed in equal proportions and it takes 2 minutes only to get hard. As far as the substances are concerned, these are natural and have a pharmaceutical purity i.e. 100%; in other words, this glue is fully harmless for any other organism in the aquarium. Moreover, the material is easily covered with coralline algae (calcareous red algae) and other organisms. The new coral glue is on top of it fully odourless. The new coral glue will be available in 4 weeks.