One pass with a wet finger, and never a second
Preparation
Remove the old sealant completely and let the joint dry fully. Silicone will not stick to old silicone and a damp joint fails in months.
The bead
Cut the nozzle at forty-five degrees to the width you want. Move steadily; the commonest fault is going too slowly and laying too much.
One pass
Wet finger with soapy water, one continuous pass, and stop. Going back over it drags the skin and there is no recovering from that.
