If you now have your temperature and humidity under control and are waiting for the Rustblue product, why not give the LMF another try? If you would rather not try it on your parts, use a test piece. Although not a fan of LMF due to challenges in stopping the action, it is the most aggressive product I have used and has never failed to get the job done. Test pieces are an excellent way to assess the effectiveness of different products and processes although, to some extent, the effectiveness of any given product is dependent on the composition of the steel.