Actually it's available in any colour you care to think of but only as a special order in big quantities, we used to have it in "Post Office Red" especially for sealing up the bodies we made for the PO, the panels all were pre-coloured as well so we didn't have to paint the finished vehicle.My weapon of choice in sealants is Sikaflex
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Limited colour choice mind: black or white
It's amazing what you can learn on a welding forum, I'm just about to fit a new shower and wasn't sure how to seal the tray, now l know. I'll be buying some classi seal in the morning.
I think the mistake most people make with showers is putting the tray (or bathtub) in first then tiling from the top of it. I always tile the walls then put the tray in, then you can get 4" deep sealant down the sides of it, no leaks that way
Also means that if you re-model the bathroom later, you don't have any gaps in the tiling.
The key is to dry the shower tray when up have had a shower it stops the mold as there is no damp/wet for it to grow in but folks don't