we waited 1 week to allow the concrete to dry out , gently removed the wooden forms and hoping for a smooth edge -- sods luck ,the back and far away side were perfect , the two facing sides looked like swiss cheese ,i spoke with my friend who is a plasterer and he told me to make a cement mix 4:1 and trowel the facing edge smooth then gently rub it in circles with a sponge .
it matched the top perfectly ,on inspection he said i should have spent longer working the top with a float and could have had a smoother finish - i was just pleased to have a slab!
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