Thanks so much everyone for your advice. I was going back through some of Gary's videos trying to find something. I think i saw the one where he put acrylic over spray paint and put turps on.
Hadn't heard of the glue one so thanks for that Jan.
And thanks Donna for the denatured alcohol tip....will have to go to the chemist as i've never seen that anywhere else...in a hardware shop for example. I wonder if its known by another name (i'm in Australia.) Maybe its called that everywhere.