also mate if you are using it as a base coat ring k-rend with the details of the job and ask their advise you might need hpx plus acrylic r7 which is pretty dear, if it goes tit's up it's alot of materials to pay for!!
HP 12 is a prep key coat, use this on engineering/stock brick, or smooth concrete similar to weber rend aid. HPX is for bedding fibre glass mesh on expanded polystyrene ect dear though.
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