Hide shipping options by shipping class

Hi,
I have two shipping classes; Liquid class and Solid class.
I use Table Rate and Fedex plugin.
Table Rate is used for Solid class only by weight and Fedex is used for both classes by weight.
Liquid class can only ship by Fedex.
Solid class can ship Fedex as well as Table Rate.
Therefore if a customer orders a Liquid class and a Solid class, I prefer that only Fedex shipping option shows. Table Rate shipping is hidden.
I have seen some code on the web for doing this but none have worked so far. I think the best that could fit my needs but did not work is at: http://stackoverflow.com/questions/17409112/hide-shipping-options-woocommerce
Any help would be appreciated.
Vijay