Use the Omega(pink stuff) then, It has a bit of castor in it. It isn't actually the nitro eating the engine rather the byproducts of it's decomposition(from what I have read). But they say castor is supposed to give better protection from that.

Are you getting the bearings from JK cos you could probably get them from Bearing Man in Maitland for less, give them the diamensions and any info you can get off the old bearings