I am offering a half used 10 litre tub of 'Febond Blue Grit' which is a brilliant paint/roller on 'extra grip bonding agent' used to prepare ceramic floor & wall tiles etc prior to over laying them with new tiles. This product saved me loads of hard work & time having to hack up all the old tiles/scoring their surfaces to ensure a good key.
There is probs enough in the tub to cover 20 sq.metres
This tub cost about £25 so give it a try!!
COLLECT FROM SEAFORD ANYTIME, I WILL LEAVE IT OUTSIDE FOR YOU.