This has been cussed and discussed may time on and off the net. The benefit of hard shelling is when you are working alone and can not wet the whole wing and get all the glass on at one time. Note this is only known from research not actual lay-ups your mileage may very. Larry F and I had a good discussion about this issue and may give some incite on it also.
Eric Pitts Tri-axel KR2S Terre Haute Ind.