i agree with the others best to board it with it being single skim.
i you did render it a sbr cement slurry splaterdash will give a key to render too but as said you will open yourself up to damp problems
i prefer not to do verbal estimates i like to look at the job have a chat with them then when i get home i can think about what needs doing work out a price on mats and labour then put my quote in
your looking at about 3mm on first coat once you have flattened the first coat cleaned up any angles and cleaned tools buckets etc you should be ready to knock up second coat and lay on.
you should only need about half the amount second coat
thistle bond it needs about 24 hours to cure wicks bonding agent you can go over in about 2-4 hours i belive.
what is the surface your skimming over is it a sand and cement surface maybe this will pull in very fast and cause it to crack.
if you use pva over a surface like that you want to put...
i dont think you can do a city and guilds in one week it wont give what you need to learn 1 week may only give you a certain module but what you want to be looking at is a 6 week ica this will give you a city and guilds and i would also advise on taking the nvq option aswell.
then you can...
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