Thinking about the Holts Piston Seal in the last post brings to mind another product that has come in for a bit of stick. Bar's Leaks. It has become fashionable to rubbish this stuff but I have fond memories of it, especially the smell. Was always a good idea to have a can in the glove box just in case you were caught short, especially in the old jalopies we used to drive. Anyway the problem with Bar's Leaks was that it was usually, if not always, added to cooling systems when everything was on it's last legs, and with all the sludge and gunk still in there ended up like a kind of thick soup. However....IF THE INSTRUCTIONS WERE FOLLOWED...read drain system and flush....it was OK. Bar's Leaks was made up of a spoonful of little brown pellets and soluble oil. The pellets dissolved in the hot water, then adhered to areas where seepage was occuring, building up to eventually plug the hole. The liquid was soluble oil which was why the stuff turned milky when poured into the radiator. The soluble oil raised the boiling point of the coolant from 212 F to about 235 F so was usefull in that respect. We still use soluble oil in the cooling system of the Amco Mini today, just as Dave and Rod did in 1972....good stuff. Bar's Leaks is still on the market, maybe improved but seems to have lost it's smell. There are lots of other radiator/cooling system/ head gasket sealers for sale today, which just maybe superior, but good old Bar's Leaks got us out of some sticky situations a few times. You could also hunt down the nearest poultry farm or shop and buy a couple of eggs to crack into the radiator. Have not tried this but apparently works. 'Scrambled eggs anyone'.......