1) sand the wooden base. Don\'t use sandpaper, though; use steel wool (the super-fine kind that is used for furniture). Be gentle or you\'ll leave streaks in the wood (if you\'re using those cheap soft wood babes that you get from Brico stores...)
2) take an old t-shirt or a piece of wool and remove the sanding residue VERY CAREFULLY. Otherwise it will soak up the stain and leave ugly blotches.
3) Take another piece of a discarded T-shirt, dip it into your chosen stain and gently caress your base, following the wood\'s grain. (Some other people like to use a brush, but I find it harder to control the quantity that way...)
Do many light passings, not an heavy one, and you\'ll be able to use even water-based stains without warping the wood if you brush on some wood conditioner before staining. I have tried many brands (all of them cheap ones from a Brico store) and got more or less the same results in the end, after you\'ve poured on the resin finish, but gel stains are the easiest to use.
Remember also that stain alwais dries darker.
4) Let the base dry overnight
5) Buy one of those two-part resin-based finishes. Here it is worth investing a little more money, as the finish is everything!
I found a very good one but forgot the brand; I\'ll check if you are interested. Anyway, place your base on a Pringles tube or something - there must be free space under its sides - with LOTS of newspapers underneath. Mix the two components and pour them over the base. With a piece of paper \"guide\" the fluid so that the excess flows down the sides and covers them evenly. Wait a couple minutes, then gently breath on the base - that will bring the air bubbles to the surface. Let it stay for 48 hours, well covered under a box (if dust or hair gets stuck, it will spoil the finish and you won\'t be able to remove it!)
When it\'s dry, the finish will be shiny and glass-like, but with some \"spring\" (if you press into it with your fingernail, you will leave a mark, but it will disappear)
If some drops condensed under the base, scrape them off with a blade.
You\'re done!