Ebay is the mother of all! Just type in hydrographics film and there's thousands to pick from to do a gun grip you dont need much. Basically you need to buy the film, hydrographics activator aerosol, lacquer (I used matt lacquer coz I didn't want a shiny grip), you also need to bear in mind a base. With my grip I didn't use a base because it was black which went with the camo, but for exapmle if your using multicam film, you will need to give the grip a white or tan basecoat to allow the film to look its best.
The actual process is fairly simple, you need to cut out a piece of film that is the right size for the piece your going to dip. I like to make sure there's about an inch excess all round so I know I have enough. You need to the border all the film with masking tape so it holds its shape I'm the water and also stops it from stratching when activated. To find out which way up the film needs to go in the water you need lick your finger and touch the corner of the film and whichever side is most sticky that goes water side down.
So your set up ready to go, what you do next is fill a box up with water to 28-30 degrees (temperature is important!) When you use a box you need to make sure its big enough so whatever you dip doesnt touch the sides or the bottom. have a stopwatch on your phone ready then lay the film on the water and allow it to hydrate for 80seconds before spraying it with activator, just enough so the film goes mirror like and no more, and then slowly lower or dip your piece through the film, give it a shake under water and lift it out. DO NOT TOUCH IT! Rinse it straight away with a shower head or something to get all the gunk off it, takes about 5-10 ,ins then allow it to fully dry for a few hours before lacquer. Then your all done!
Sorry for the essay mate! Lol