Some years ago the Bosch caps on my '93 SL500 were arcing so badly that I bought replacement BERU caps that in my opinion are better than the original Bosch caps.
Recently though even the better BERU caps have been tracking and arcing. I had to stop and do the well practiced caps removal and moisture wipe. I was wiping them with a rag and the Allen key and managed to scratch them!!
Today I removed both caps and polished them using a Dremel drill and a brush and pad with 3M 'fastCut'.
When they were burnished and all traces of tracking removed I coated them with a two part epoxy resin.
They now look almost new apart from the scratches that I made with the Allen key.
Before:
After:
Hopefully now good for a few thousand more kilometres
Recently though even the better BERU caps have been tracking and arcing. I had to stop and do the well practiced caps removal and moisture wipe. I was wiping them with a rag and the Allen key and managed to scratch them!!
Today I removed both caps and polished them using a Dremel drill and a brush and pad with 3M 'fastCut'.
When they were burnished and all traces of tracking removed I coated them with a two part epoxy resin.
They now look almost new apart from the scratches that I made with the Allen key.
Before:
After:
Hopefully now good for a few thousand more kilometres