Exterior: You want it to look clean, new and shiny. Some RV's are too old to ever look shiny so the best you can hope for is clean. Mine is only 4 years old but I still had to use a buffer to get all the acid rain off. I used a liquid wash/polish for this. Use Tire Foa...
If you are striping a long vehicle like a truck or van it is probably best to go with a mechanical pinstripe machine as it will keep the width consistent all the way down. If you are looking for a layered look using many different colors you will probably want to go with stencil tape ...