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French polishing a piece of coolibah burl, and noticed that when dry, it was getting a few blotchy patches of haze. Polished again tonight, and it appears not to be there.
The only difference is that I haven't brought it inside to dry, I left it out in the shed. Would I be right in assuming that the haze is from condensation? So far that is the only thing that makes sense.
Called bloom or blush the haze is caused by moisture being trapped in the surface of the finish, usually caused by cold, damp or humid conditions, but sometimes it comes from the timber not being properly dry and a dramatic change in temperature such as taking it inside to dry or putting a heater on the work, etc.
It is usually fixed by another application of polish.
We may shortly have an additive that will stop the problem of bloom and make the shellac more easy to brush on as well as french polish. (Working on it now).
Hope this helps a bit.
Cheers - Neil :)
Yes, it is as I suspected. Left it out all night and brought in this afternoon. Very nice finish now...;)