So which bed liner is the better option? That ultimately comes down to your preference. You will be able to find drop-in or spray-in bed liners available for any Silverado pickup.
Protection: A spray-in bed liner provides better corrosion protection because it forms a tighter seal to your truck bed’s surface. If you go to the beach or are off-roading in your Silverado, dirt, sand, and water may get trapped between a drop-in bed liner leading to corrosion and rust. A spray-in bed liner can also be applied to every area of your truck bed, unlike some drop-in bed liners.
On the other hand, drop-in bed liners provide a thicker layer of cushioning and may offer greater protection for your truck bed against sliding and sharp cargo. Drop-in bed liners also protect your truck bed from dents and offer greater skid resistance.
Durability: Drop-in bed liners and spray-in bed liners are made of durable materials designed to last for a lifetime. Of course, both applications run into their own problems. Drop-in bed liners are subject to punctures and scratches from cargo and may also crack and warp from extended UV exposure. Spray-in bed liners may become discolored over time because of extended sun exposure and they’re also subject to chips and cracks from cargo surfaces.
Cost: Drop-in bed liners are generally cheaper than spray-in bed liners. Replacing a drop-in bed liner is cheaper. Sometimes it’s cheaper to replace a spray-in bed liner than repair it.
Installation: Both can resemble easy DIY projects, although spray-in bed liners should be installed by a professional. Some drop-in bed liners are drill-less and only require simply loops and fasteners to secure them to your truck bed. They also require very little cleaning.
Installing a spray-in bed liner requires a complete scrub and sanding of your truck bed to ensure the urethane properly bonds to the steel surface.
Other Considerations: If you're looking to sell your Silverado soon then I wouldn't recommend purchasing a spray-in bed liner. If your Silverado came with an original bed liner than you might be better off sticking with it or purchasing a drop-in bed mat for added protection.
Both applications will increase resale value, but spray-in bed liners offer a better finished look. Keep in mind spray-in bed liners retain a hard surface so they won't be the easiest on your knees if you’re crawling around your truck bed to reach your tool box.