Why does the caulking around our bath tub keep cracking and pulling away from the wall?

I made sure the surfaces were as dry as possible. One brand of caulking I used wouldn't even stick to wall, the second one I used seemed to work really well, then after about a month it starts to split and separate from the wall and or the tub, why does it do this?Why does the caulking around our bath tub keep cracking and pulling away from the wall?
It pulls away because when you fill the bath it drops a few mm with the weight of the water!!


You have to fill the bath with cold water then seal it.Why does the caulking around our bath tub keep cracking and pulling away from the wall?
You need to really have the area you want to caulk as clean as possible. If there is any mold or moisture on the area, the caulk will peel away. You should strip it, clean it, and them leave it for a day and then re-caulk it.
Sounds like the caulk is drying out and shrinking. If you cleaned the surfaces real good and used the right caulk, you shouldn't have any problems.
First of all, it's probably not the right type of caulking, or it has been re-caulked without properly removing the old caulking. There is also the possibility that there is water getting in behind the caulking and causing the wall to swell. Look for loose or cracked grout between your tiles. Solution.... remove all caulking and use PREMIUM latex caulking specifically made for bathtub tile.
You didn't buy the right caulk. Buy Silicone caulk.
Your bath may not be level OR secure on its mountings .


So when you fill it it moves very slightly and cracks the caulk or silicone surround.
Dry is just the beginning (a hair drier helps with that). Clean is just as important. Such as soap residue, bath oils, mold and mildew etc. etc. Washing the area with isopropal alcohol helps. Also keeping the area dry until the caulking cures fully. Taping plastic rap to the shower walls shielding the caulk from water for a day or two helps enormously. A urethane based caulk is an excellent material for this. Also, fill the tub with water before you caulk. This will take up any give in the under structure so that it won't pull away later. This takes a little thought so you and the wall stay dry. Happy caulking.
it sounds like the tub is moving and needs to be secured to the wall


call mike holmes