In the mid 80's a had to buy some Honda branded sealent for the Rocker cover on an XR250, the rocker cover is also the holder for the rocker shafts on the RFVC engines so you can't use a gasket, it cost $50 then!!!
probably a silmilar type of product, Loctite products aren't cheap in the Uk either although you can get some good prices on Ebay.
http://shop.ebay.co.uk/i.html?_nkw=l....c0.m270.l1313

