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Doms CB550F1 project
DomP:
--- Quote from: Bryanj on September 23, 2023, 10:58:32 PM ---Leave them alone they can be a real pig even with heat
--- End quote ---
I'll leave well alone then Bryan, the pitting is what concerned me. I can just oil the updater a rub down its only a couple of the front studs.
DomP:
I've had a minor setback, I fired up the bbq having had my cases warming overnight at around 20°C, set them in it at the lowest setting and have been gradually increasing it but I've got small bubbles forming. I did heat the cases through before paint but I'm guessing I still have gassing off? Is the only option to strip and start again?
Nurse Julie:
Yes, you will need to strip what you've applied and clean cases thoroughly. It's usually oil impregnated in the alloy that causes the blistering.
DomP:
--- Quote from: Nurse Julie on September 24, 2023, 11:50:40 AM ---Yes, you will need to strip what you've applied and clean cases thoroughly. It's usually oil impregnated in the alloy that causes the blistering.
--- End quote ---
I knew the answer really, my engine was bare alloy when I got it so there could be loads of oil etc absorbed into it. I degreased, dishwashered it and scrubbed it with thinners so I'm not sure what more I could have done, I'm thinking it's remaining moisture rather than oil so I'll try baking the top half more slowly to see if a gentler temperature gradient helps. I've got nothing to lose in trying and only time and a can of spray paint if it fails!
McCabe-Thiele (Ted):
I'm concerned by the mention of a dishwasher what detergent did you use as a normal dishwashing tablet attacks aluminium?
IIRC the paint needs 24 hours of air drying in the summer before heat treatment.
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