Silicone sealant

Hi almal23 . I can higghly recomend sicoflex silicone .you can purchase it in various colours . Bit expensive but like i say well worth it . I get it from travis perkins or jewson . But you should get it from the big sheds b.q   etc. Bit pricey though as ive found out on many things 

If you DO choose to use a Sika product, make quite sure that it IS a silicone.  Sika are best known for their polyurethane adhesive/sealants. Though excellent for their purpose, they are not what you want for simple internal sealing.

Personally I would just use a suitable silicone sealant from Toolstation/Screwfix at a small fraction of the cost. I have always found them entirely satisfactory.

Unibond kitchen and bathroom. stays white and flexible.

It depends on the use. If it is to go around the waste pipe hole - especially under the shower tray - then you want a non-setting sealant which you can get from any caravan dealer fairly cheaply.

BE AWARE........if buying from any of the diy stores.........check the use by date!!!!.(I got caught by a B & Q many miles from home and wasted £6 odd on an unusable cartridge.I was nearly 70 miles from any branch when the fault was found!)