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Careful with ultrasonic machine!


GenTLe

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Last week I gave a run to my BlackBay on the timegrapher machine and, noticing 0.4ms beat error and + 23s/d, I decided to give it a full service.

While I was washing the parts I also put in the machine the Tudor crown.

Well... When I took it out the black enamel of the crown engravings was half away :mellow:

Probably a bad quality enamel or a not well degreased surface when applied.

So I proceeded to the restoration:

1) wrap the watch (that has been already fully reassembled) to avoid that any possible squirt of diluent or polish peste could find its way to the bezel or crystal

2) remove the rest of the enamel with a very tiny soft brush alternating it with a bigger (5mm) harder one, both lightly dipped into nitro diluent

59858f97372be21bab5e25b93d5eeda9.jpg

3) apply a new enamel (I used nitro based one I had around), diluted enough so that it fills the tiny engravings, using the very tiny soft brush of point 2 upper

6cd2475db6f8f4fef4daa5be4934c74e.jpg

4) after 1 hour, take a lint free cloth like linen, put it well stretched on a flat surface and drip a bit of diluent on it. The cloth shuldn't be drenched, just humid. Then pass the crown over it.

And this is the result (after I polished again a bit the metal)

412460a820e396a2feed6849a66f0eb2.jpg

So take care of what you put in the ultrasonic machine...

Cheers, Gentle

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