Ok I did herc on my pup's bed and part of the fenders

Number one: buy blue painters masking tape. Blue tape means easy release and is avail at any hardware store or the like

Number 2: paint the lower half of your fenders if your truck has some type of divide to guide you. Like the lower half only. I did this and it looks great.

Number 3: if you do the rear bumper it will look terrible. Trust me, bedliner looks nice on flat surfaces. If you put it on a rounded bumper it will just look strange. Secondly looks-wise, your bumpers frame the truck I would prep andpaint them a glossy color. So theystand out. If you use bedliner the rough look will contrast what in your mind would seem like should stand out. This is my opinion. the same goes for the flares. Paint them semi or full gloss rather than a textured paint. They look stupid on my truck with herc. The herc licke I said looks nice on smooth flat surfaces, if put on a curved or molded surface it makes it look all clumpy. You lose the straight lines look and it looks like crap.

If I did it again I would not have done the flares.

Number 4: if you use herc I would recommend it but keep in mind it fades in the sun FAST. I mean like 1 week. You may want to paint the herced surface with glossy paint but I would not recommend it since herc is poly-based and spraypaint is alkyd based. May not agree together but they might.

So again, do your flares and bumper and within 2 weeks in the sun you will have a bumpy, textured, flat surface that looks like someone smeared cement over it like a bad paper-mache project.

But it looks damn nice on flat surfaces......