Xisca N: To answer your Question from your Header/Forum Thread - The various compounds that can be found under the category 'Water glass ' will seal off the pores in the cob , retaining water, Not what we want there, if used for repair due to the high rate of expansion , you will have the same problem that you have trying to use metal mass in the Rocket stove different expansion rates, where you probably have the best results will be where you make up individual parts like a separate Heat Riser that you bake in place and then use as part of a R.S.M.H. Build at a later date .
I to wish the temp could be just a little higher ! PYRO Allen L.
Success has a Thousand Fathers , Failure is an Orphan
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A rocket mass heater is the most sustainable way to heat a conventional home