Hi,
I've recently recoated interior wood doors with a wood stain (oak).
After about 3 month started seeing white stains all around the coated
areas.

http://webpages.charter.net/danushav/door.jpg

Not sure what I did wrong but seems it should be somehow related to the
heating (forced air) being turned on, since I've not seen anything like
that beforehand.

Any ideas?

Thanks,
Vlad