The first step is to make sure you use the correct size sub patch for you tear or rip.
Using either the white or black sub patch, cut this to size so it’s about a cm bigger than the tear and rip.
Once you have done this, you need to get the sub patch in to the back of the tear / rip
Ensure its flat and smooth or you will end up with a lump in your leather item.
Once this is done you can then apply a small amount of glue to the back of the leather and then pull down one side so it sticks to the sub patch, once you have done this, you can then apply some more glue to the other side and ends.
As you pull the second side towards the first side make sure you join the tear together as close as possible, then apply with a tooth pick a line of glue down the tear / rip line
Once you have done this you can apply clear Sellotape to the tear to join the line together closer, before doing this test the tape in a small area to ensure it does not take away some of the top surface colour as it can in some cases do this.
Then leave to dry for around 30 mins and very carefully remove the Sellotape, going down the tear not across the tear or you could open it back up again.