How can you harden old Masonite siding?

To harden old Masonite siding, first, inspect for any damage or rot and replace any compromised sections. Apply a high-quality exterior primer to seal the surface, followed by a durable exterior paint or sealant specifically designed for wood products to enhance moisture resistance. Additionally, consider installing protective barriers, such as awnings or gutters, to divert water away from the siding and reduce exposure to the elements. Regular maintenance, including cleaning and repainting, will also help prolong its lifespan.