I've said it before and i'll say it again. HP12 is fantastic gear, i've used it on blocks, bricks, dash, render, painted render, sandtex (pinned) on literally hundreds of houses. I've dashed on to it, put thin coat on it and just rubbed it up for a coat of paint. I've never ever known it to fail. Ever.
Its absolutely bulletproof. I've used other bagged renders but for me hp12 is by far the best base coat, easily available and the krend dash receiver is also great imo.
I'm open to trying other brands if any manufacturers fancy sending some out though