I think you need to ask another question, "was it successful ?" In the last 5 years of ownership I had mine blacked with bitumen, 2x by boatyards and once myself after a lengthy prep. Each time I had rust on the waterline within the year. Needless to say this did not meet my expectations. I had it out the water again this summer and attempted a DIY epoxy job, prep was very time consuming but managed to cover the waterline, weld seams and pitted areas.Early days yet but I'm hoping for more success than the bitumen blackings.