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As part of my winter programme I had a crack repaired in the exhaust manifold on my 745. My buddy is a metalurgist in Sheffield and he managed to get it welded with nickel rods. Apparently 82 years of "thermal cycling" didn't help to keep a weld on the cast iron from cracking when it cooled. Anyway he's an expert in his field and the end result was a perfect and almost invisible repair even if it did take 4 months!!

I painted it with high-temp enamel from www.frost.co.uk before refitting using POR 15. The picture from their website below shows its good for 1200F (which to us Brits is 650 Centigrade) - more than enought I thought.

Well the Sunday afternoon trip to the fuel station required a stop-and-cool event as clouds of blue smoke were billowing from under the hood!!!

The same day I received a new catlogue in the post from Frost and the new picture of a tin of POR15 shows its only good for 150 degrees C. Seems I should have bought manifold paint!!!

So next weekends job is to scrape the paint off and do it again....

We all make mistakes!

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Thanks for letting us all know about your experience. Many of us will be doing similar work in the near future and you have saved us many hours of extra work.
good luck, thanks, and well wishes from me in getting it back in shape.

Gene