Finally removed the heater box unit and matrix from my Amazon today. The 40 year old matrix is in good condition and just needed a good flushing. The heater box unit is also very sound with no major rust, so will just need wire brushing and a paint. I have bought a set of new foam seals from Brookhouse in addition to new drain hoses. The old foam has been bedded using a type mastic/sealant which has now been stripped back. Could anyone tell me what type or brand of mastic/sealant I should use when reassembling? It needs to be black to match the new paint on the unit. Many thanks.
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