Nu-Glaze the Alternative to Putty 

Nu-Glaze -- The Alternative to Putty - www.nu-glaze.co...
Developed and created in South Africa, Nu-Glaze is an alternative to putty and other traditional window beading and -glazing solutions, suitable for frames of steel, wood, polywood, aluminium, and even concrete and polycrete.
Nu-Glaze(R) comprises of two types of beading systems: A profile for steel or concrete window and/or door frames and another for wooden frames. Both can be used either way, depending on the frame size.
Due to its unique design, it is much more difficult to remove from the outside (although it is actually much easier to remove from the inside if need be). As such, it provides a more secure, long lasting alternative to putty.