I used POR 15 on a timing cover inside the water pump area. Six months back on the road and I noticed little flecks of black about the size of metal flake. Even though I had media blasted the cover it only took six months for it to start flaking off. Over time the impeller of the water pump then took the small chips of POR 15 and reduced them to micro flakes. It would be interesting to know whether the Glyptal would hold up any better.
Just for the record, the repairs I have made with JB Weld started to fail at about the 7 year mark. It seems that both instances the problem might have been with the antifreeze slowly making its way under both the POR 15 and JB Weld. I'm wondering whether that even blasting and cleaning the surface still has some embedded corrosion that finally lifts the repair.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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