Good product
As expected, this is typically very smelly- as are all these type of resin based fillers. So not much fun if retro using in a shower cubicle! But it works. I needed to darken a little using some colour tint [ available elsewhere] to get the right shade [very easy] and only worked small areas at a time 1/ because the setting time is fast [be wary of too much hardener] and 2/ it's pretty hard work scraping back the excess - which is best done before full curing and hardening. If you haven't used this technique before - practice on some old tiles first.
Large or deep holes are best built up in layers or part filled with e.g. plaster. Once set, the smell goes rapidly and you can breathe again!
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