Best invention for marine work I've come across. I have even mounted water heaters with them and they are ridiculously strong. I then use PVC board, Starboard or Seaboard to mount the items to. Hamilton sells Weld-Mount but be aware they, Weld-Mount, are very proud of their product, price wise, and they should be. Be careful it's addictive stuff and once you use it you won't go back...