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Hello Adriano
You asked me to comment here, but I haven't got an answer for you regarding the technique of putting pastel under oil painting. The only thing that does concern me is how hairspray might react with the oil paint - what it might do to the painted surface after time. Perhaps you should do some research into more environmentally-friendly art fixatives that have been tested to use with oil paint. I am sure there's something out there.
Also, although I hate to stick my oar in, I am not sure why you would want to cover up a good, finished and satisfying pastel work with oil - why not just do an oil painting as well as the pastel.
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