not too sure wot ur talking about, but i assume u mean the standard GW striped effect?
all u do is get the colour u want, darken it with black, and then paint lines goin from the edge towards the middle, then highlight it using ur main colour, but make sure when u highlight the lines, dont go as far towards the middle and paint inside the existing line
For trim just use a fine detail brush, dip it in the colour of choice, and make fine stokes of end of carapace.
If ya want it glossy, I think you can buy this special paint wich makes it all shiny. Altough you could use PVA glue since it dries transparent and shiny. I have never used gloss technique myself but I do use the trim effect, looks pretty cool on ma 'nids.
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