OK, let's see how 'serious' this glue is
It says 'all conditions' (which I hope includes oily environments) and a big temperature range, so suitable for engines.
The remainder of the bond peeled off dead easy, so I don't think the factory glue was that strong to begin with, but I stripped it all down, sanded the piston to give the glue a key and left it in the airing cupboard for a few hours. Felt like a good bond when I picked at the edges, but we shall see!
In other news, I fitted a rubber bobbin to the Revo intake pipe mounting, which is better than their method of a plastic spacer and leaving the bolt loose.
And I threw on the newest revision of black expansion cap and washer cap, which I picked up from AKS Tuning the other day. Looks neat I think