Reply #2: The depth for one. i/2 inch requires about three passes.

[Wash. state Desk Jet]

I know some guys think massive caulking is the answer. Read the manufacturer directions for caulking wide and deep.If for example the depth is half inch,you would expect to make at least two passes to bring it to a finish look ,more likely three passes.The depth is the killer. 100 per cent silicone caulk is always recommended for kitchens and baths.But the depth sort of explains why it cannot cure..Bad batch, perhaps ,-that could be the problem.But the depth indicates the problem. Now what yer might try is turning up the heat!

I do hear people say that they severely caulk with massive amounts all the time and it always works for them! Looks like hell ,but it works!

On that depth, some guys that make shift it use caulk backer rod. It's a filler ,sort of fills up the gap. Than you apply yer caulk over the backer rod. Backer rod is a flexible material ,round, it comes in different diameters ,well rounded the stuff is! It's called caulk backer rod, sold where you find window insulation and that sort of stuff at builders hardware! However some guys are too lazy to make the trip to the store so they use what ever is handy such as newspaper or card board ,toilet paper and what have you! Because they know they want to get out of there quick and they sure as hell don't want to be called back! Ah, handy go lately if you know what I mean

Other guys find cool ways to hide those flaws. I suppose you would call that the tricks to the trade.Anywhooo, read what it says on the caulk container. It may say for depths greater than 1/8 of an inch ,it may require more than one pass- Or it may say if the depth is 1/4 inch or more,it will require multiple passes allowing curing time between each pass.Essentially you put it on so thick, it could not possibly cure itself!
Anywhooo, it's Friday and I'm off to the circus if you know what I mean!