Reading through all the rubbish of boot polish, peanut oil and linseed oil (which i used to use) will just stain your paint work when it rains. Meguiars stuff is rubbish as is autoglym.....the only decent recommendation is Black WOW. Since i have used it ill never used anything else, the stuff might cost about £18 and it looks small, but considering i have done the trim on my car 5/6 times and not even used 1/4 of the bottle its well worth it.
You seriously think boot polish runs when it rains?!
Boot polish is fantastic, the polish/wax in the squeeze tubes goes on very easily thanks to the foam applicator on the top & doesn't need buffing or anything. The bumper has to be dry & clean, also it has to dry before it is water resistant else it will run if it rains! The only down side is although very black it leaves quite a dull/matt finish, but it does last & at less than £1 per tube it's cheap stuff!
I've just switched from shoe polish/wax to Chemical guys new trim gel. It's relatively inexpensive, no more than Mequiars etc & works amazingly well. You only need an amount the size of a 5p to do all the trim on a MK3, using an applicator pad it wipes on easily. If you accidently go on to your paintwork it just wipes off with a microfibre, although like boot polish it's not water resistant until it's dried.
Best of all it dries to a high gloss finish, for plastic anyway, & it lasts! Water beads just like on waxed paint! I won't be looking for anything else for a good while!
I was going to get black wow but it's had a lot of mixed results & in short was simply to expensive, to buy the same amount of black wow as you get in a an £8.99 bottle of the chemical guys gel you'd have to fork out about £86!!
