Patching a broken valve - GIF

[mlochala]

Yes it does look like JB weld but many 2 part epoxies look the same. One thing I noticed was his lack of proper surface preparation. You never want to rely on the bond between paint and metal or epoxy on paint to achieve ultimate bond strength,

Not to mention the next time they try to open or close that valve and then discover some of the epoxy seeped through. That won't be much fun.

[NeiljohnUK]

I started using Belzona in 1978 in the power industry for repairing stuff, biggest job that established them in the UK was the Hinkley Point 'B' power stations sea water cooling butterfly valves, originally designed as shutoff valves they had been used operationally as variable modulating throttle valves and suffered significant erosion of the butterfly and the body as a result. Machining off ~ 1 to 2" of surface, rebuilding with Belzona and re-machining to original spec enabled them to last much longer without significant erosive damage/wear. I still use Belzona at work, repairing Process Cooling Water system parts on high vacuum sputtering machines, again machining away the eroded/corroded metal, rebuilding with Belzona and refinishing when spare parts have a 6-9 months lead time and will suffer similar problems inside 2 years, the repaired parts are still good and in use 4 years later.

JBWeld isn't quite Belzona, but still useful, my F658GS suffered the usual BMW F800 leaking oil/water heat exchanger problem due to corrosion creeping under the seals, machined off the worst, grit blasted the rest to remove deeper corrosion and form a key then rebuilt with JB, machined it flat then top flat skimmed with JB simply to fill any exposed opened bubbles from mixing first batch, polished on crocus paper to finish, a lot cheaper than a new one at £130 and with that epoxy surface never likely to corrode again.