Joined: July 2004
||Posted: 11 Sep. 2019,09:58
I'm struggling with that "recipe". What is a "part"?
Cement is a powder, so measured in kilograms, whereas this Prime Bond is, I assume, a liquid, so measured in litres, as is the water. Given all that, how can a 'part' be defined?
It may well be that, on average, 1 litre of SBR-equivalent will need 5 kg of cement powder to make a suitable paste, and then another litre of water to make it thin enough to work, but it's a bit amateurish to decribe kilograms and litres as being 'parts'. Or do they mean 1 cup of the jollop to 5 cups of cement powder? Your guess is as good as mine.
I'm also wary that many so-called 'primers' are effectively diluted SBR, so there may already be ample water content in this product.
In practice, most experienced contractors wil mix "sufficient" cement powder with a quantity of liquid SBR to make a workable paste. Adding water may well extend the coverage, but it may also compromise the adhesiveness, and I'd only add water is the resulting paste was way to thick to work.
Bear in mind that these self-made primers have a relatively short pot-life - maybe 20 minutes, so don't make too much at once.
Coverage will vary and is largely determined by how generously you coat each paving unit, but, as a very rough guide, a litre of SBR mixed with cement will usually be adequate for around 50m².
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