Here are a few methods that will crate a 'shiny' finish, combine them as you wish to achieve desired reflectivity. Since buffing/polishing can be tough work, ensure your mold and concrete are acceptable before you start, this will minimize the time spent polishing.Mold:The less imperfections here the better you finished piece will look. Try to use a mold with a smooth surface and with no debris.Concrete (type):There are quite a few varieties, and they will all have their pros and cons. If you are looking for something ornamental and strength isn't really an issue, then try to look for concrete with small or little aggregate. They do make 'tinner' concrete which you can buy commercially, though a bit more expensive the results are amazing.Polish:This is the end process. When you have done all you can with teh above 2 steps you must turn to polishing. This is labour and time intensive. Use the correct grains from course to fine just like when working with wood. When you've got it really really smooth and awesome, slap on some sealer to keep your work looking new. Good luck!
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If the mold is shiny, then, yes, like this example.
what if i used a takeaway box for the mold?
Aluminium foil - it should come out fairly shiny.
Cardboard box - it will need polishing.
yes that was why i asked this question
if you look at the homemade concrete worktops instructable it gives a detailed account on how to polish it!!!
Concrete is funny stuff, you don't usually get "shiny" from it. But you could finish it to shiny. Anyhow you're going with tile-adhesive aren't you?
yes im expermenting with different adhesives and things
And /or you can polish concrete.