We use Belzona 1111 to bond new clips inside vessels to carry internal components when no welding can be performed. From memory it's about £165/kg. Some customers swear by it, others won't consider it. It dries very hard, but can be ground/filed etc but wouldn't want do much by hand! Very messy to mix/apply, like the proverbial to a blanket. Surface prep is key as well. Belzona do another product now (1511?.) which doesn't require such good surface prep and cures under water/liquid etc