Plaster key question: Using it with plaster sand - Boma build

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TinusBez

Race Dog
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Vespa (all models)
Hi Guys

I've built a boma and my guy is starting to plaster later today. Two things:
1. I am going to use oxide in the plaster - think I may have too much but I'll make notes re the colour to get the recipe right - I don't want to paint this thing is the reason; and
2. I've seen folks use plaster key with plaster sand, the oxide becomes less of a thing here as that is all it does is to change colour. It gives it a nice finish is the only way I can describe it but too much plaster key - I really don't know how to explain it - it gets messy.

Question
The mix (found on the internet) speaks of 3 part river sand, 2 cement and 1 part plaster key - this was found on the likes of Jacks Paint and other paint places. Sometimes they refer to 1 cement. What is meant by part?

I have it as 3 plaster sand, 2 cement xx plaster key (bloody expensive nowadays) and then of course the oxide. I bought 3 5l yesterday, How many liters of plaster key should I use?

Tinus
 

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