Yes and No. Not all leather is repairable as such. Generally the seating areas along with the arm and headrest areas are damaged from body oils, perspiration etc. The leather has absorbed these contaminates over the years so getting a permeant repair is near impossible. Adhesion may / will be an issue or those areas will crack again with little use.
You may also want to look at using our Leather Repair Resin if you don’t want to do leather panel replacements.
If you do go ahead and repair badly damaged areas and the repairs fail, please don’t blame our products when this happens.