After some searching, I found a nice, highly concentrated Potassium Silicon product, application rate is 0.5ml per litre, so not as strong as the old Barricade, but still 4x as strong as Rhino Skin!
http://www.potsil.com/
Friends in the UK swear by Budlink, never used it myself, my usual shop doesn't stock it.
http://www.potsil.com/
Friends in the UK swear by Budlink, never used it myself, my usual shop doesn't stock it.