True shineyness comes from the inside, a healthy, fit horse should have a nice natural shine to their coat. You can enhance the natural shine with a good everyday grooming routine and elbow grease!
The rubber curry comb is one of the most important grooming tools to help bring out the natural oils in the skin. Spending lots of time grooming with a rubber curry will stimulate the oils glands in the horses skin and loosen the dead skin cells and dust from the skin and bring them up to the surface of the coat to be brushed away. It is also a nice massage for the muscles.
After using the rubber curry comb, take a stiff or medium natural fibre dandy brush and flick all the dead skin cells and hair, dust and dirt up and out of your horse's coat. Use a short flicking motion with each brush stroke. Remember to clean the dandy brush every couple of stokes with a metal curry, swipe it across the metal curry and knock the dirt out of the curry. This helps to keep the brush from spreading the dirt back into the coat. This step is mainly to rid the coat of the debris the rubber curry brought up. Use either a stiff or a medium dandy, depending on your horse's preference, some are more sensitive and dislike a very stiff brush. I like grey english fibre brushes for thicker winter coats or horses that aren't too sensitive and tampico fibres for finer coats and more sensitive horses.
Next step is to use a soft body brush, I like the oval shape with hand strap styles with natural bristles. Horsehair bristles are a good choice. Use long firm strokes and remember to swipe the brush across the metal curry every couple of stokes. This brush will help to distribute the horse's natural skin oils throughout the coat and remove the smaller dirt particles and dust that the dandy brush didn't get.
The final step, would be to use a very soft goat hair body brush or my favourite, a real sheepskin mitt and use long firm strokes to really polish the coat, spreading the horse's skin oils over the hairs and removing the final last traces of fine dust.
If you use this grooming routine everyday and spend the majority of the grooming time massaging with the rubber curry and polishing with the sheepskin mitt, you should start to notice your horse becoming shinier and shinier. Just remember not to bath your horse often, it strips the natural oils from the coat. If it is hot and your horse gets sweaty it is best to just rinse the coat with plain water to remove the sweat, this also helps prevent sun bleaching, because if you leave the sweat it can bleach the coat in the sunshine, also makes the horse itchy and rub which isn't good for the coat.
A regular good grooming routine using lots of elbow grease will really help to enhance the shine of a healthy, fit horse.