what type of waterproofing can I add to cracked railroad ties to extend their life?

retaining wall made of railroad ties. Top timbers are beginning to crack. Want to extend the life another couple of years, thinking of adding some type of waterproofing to top. What would you recommend - liquid asphalt or ??????
Reply to
Anonymous

Site Timeline Threads

HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.