Step 1 - Give the edges of your bath a quick wipe down before starting. Making sure the area is dry, grab the masking tape and place it below and above the area you're wanting to apply the sealant. Using masking tape helps you to be more accurate & stops extra sealant spilling over on to your bath & tiles.
Step 2 - This step might sounds strange but it's an important one you don't want to miss. Fill your bath with water - having the bath full means the sealant can set correctly. If you don't do this, later on when you have a bath, the sealant could crack due to the weight of both the water & yourself.
Step 3 - Next, using scissors, cut the sealant nozzle at a 45 degree angle and attach it securely on to the tube. Once that's done, place the sealant in a sealant gun which will help with easy & direct application. Starting from one corner of your bath, squeeze the trigger of the sealant gun with even pressure & begin to apply the product. Make sure you apply the sealant in one go for a neat finish & try not to squeeze the gun too hard so you don't push out more sealant then you need.
Step 4 - After applying, use your smoothing tool to smooth out the sealant, making sure you its even & at an angle so that any water can flow back towards the bath tub. When it's all smoothed out, let the sealant set. The type of sealant you have depends on the setting time so be sure to check this information before you get to work. Leave the water in the bath as the sealant dries & when it's dry, then you can let the water out and voila! You have sealed your bath!