Bizarre problem..bought some trade size tubes of adhesive....380ml as opposed to normal 310ml tubes....but now I can't fit the trade size tube into mastic gun....can anyone enlighten me as to what to do!
I recall that you live in Cork? If so try Pat Mc Donnell's - they should have the right size mastic gun. Otherwise one of the builders' providers, but not the DIY places which are useless for things like that.