To get the same colour you need to match the materials.

Same sand.
Same cement
Same quantities

What are you doing, perhaps a pic.

If your repairing an external render, you may want to look at "Monorex GM". http://www.parex.co.uk/Render_Systems/New_Build_-_Cement_Renders/Monorex_GM.aspx...

Comes in 30kg bags and a mutitude of colours.


Really easy to use.

The deck or walls. Or do you means pointing the joints between slabs.

Can you post a pic

I would mix it at 5 or 6 to 1, do enough for the job in one go, then brush it into the gaps still dry. You can work it in with a stick or whatever comes to hand. a length of 15mm bent copper tube is good.

if you want to point it in any specific way use a trowel dipped in water.

Keep any rain off and the atmosphere will harden it off over night.

Edit,

The slabs need to be dry when you do it otherwise you'll spread it all over the slab and cuss me forever.