L1 Leather Coating by GTechniq is amazing. It seals the surface and adds a level of protection previously unseen and unheard of. The coating also lessens the amount of abrasion during everyday use and is easier to clean up spills and stains.
When I coat a leather surface, I ensure that the surface is clean and free from debris or crumbs.
I then use a 24 hour leather conditioning and then apply the GTechniq coating. 
Then the GTechniq L1 Leather coating is applied 
