Has my head gasket gone?

[Dum-Dum]

I think my head gasket might of gone. My coolant system is presurising and pushing all the coolant out the radiator overflow? This is worse the more boost it gets.

Does this mean that my head gasket has gone / is going?




Also does anyone have any experience of this stuff
http://www.steelseal.co.uk/

apparently it repairs blown head gaskets and cracked blocks.

If it is gone im not replacing the gasket. If it needs work its getting a 2.1TD lump