I bought a Timo Boll ALC blade and tenergy 05 and then Andro Free Glue. IN Andro.de they demo on how to assemble, prior to putting the free glue, they put Free Seal for about 2 to 3 layers and let dry for 12hours. then they apply the free glue to the wood and rubber and stick. Is Free Seal Necessary for a butterfly blade?