I think the key here is the word "contibutes." Obviously there are many contibuting factors. Also there are many conservators out there. Since there are many factors involved in the cracking of paint, I'm quite sure that any type of white would crack if unsound practices were followed.
Robert Gamblin is not an unbiased source of information. I think that he produces many fine products, in particular Gamsol and Gamvar. However, I feel that the use of Alkyd mediums which many manufacurers promote will prove far more disasterous to oil paintings in the long run than will flake white used intelligently.
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