Hello all,
I too have a tin of ‘Petseal’ or similiar which has been on a shelf in the shed for years. The stuff I am talking about however is a structural adhesive that is applied from a cartridge with the usual DIY gun.
It’s intended for the automotive industry and used to seal body panels but also has some adhesive strength. The aim is to use all steel tender construction which can be painted and then joined without heat, This will make construction quicker and cheaper if it works. Test pieces seem to be a success. Photos and details will be in the tender description early in the new year.