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You’ll usually need to prime a garage floor before painting—especially if the floor is unpainted. Garage floors are made from concrete, which is porous and produces dust. The dust can contaminate the paint and cause issues with adherence. 

Primer creates a barrier and gives you a clean surface to work on. It also minimizes absorption to help give you an even, pro-looking paint job. Make sure you choose a primer that’s specifically designed to cover concrete flooring.

On average, a garage door can last between 15 and 30 years. However, this lifespan is influenced by several factors, including the quality and material of the door, local climate conditions, and how frequently it is used and maintained.

Key factors affecting longevity include:

• Material: Wooden doors can last 20 to 30 years or more, while steel doors typically last 15 to 20 years. More robust options, like triple-layer steel, can last 25 to 30 years with proper care. The number of layers in a door also contributes to its durability, with each additional layer potentially adding five years to its life.

• Maintenance: Regular inspections, cleaning, and immediate repairs can significantly extend the life of your garage door.

• Usage and Climate: Doors in harsh climates or those used very frequently may wear out faster.

• Components: Individual parts have different lifespans. For example, automatic openers may fail sooner than the door itself without regular maintenance, and garage door springs typically need replacement every 7 to 12 years.

While the door panels are designed to last as long as the door, they should be replaced sooner if they become visibly damaged, impact the door's smooth operation, or create a security risk.

If your cement garage floor is sinking and cracking, your first step should be to call a local structural engineer to assess the problem. They can determine if it’s a minor amount of sinking related to normal settlement or if the issue is structural in nature. If you do have structural damage, the engineer or a foundation repair company that you hire will come up with a plan to fix the issue, which often consists of mudjacking for less severe issues or underpinning for more extensive problems.

It is highly recommended to prime a metal surface, like a garage door, before painting. Primer creates a stable surface for the paint to adhere to, which helps prevent bubbling, chipping, and peeling. This ensures the paint job will last longer. Painting metal without a primer can lead to poor adhesion and allow rust to bleed through the new paint. If the surface already has rust spots, you can cover them with a zinc chromate primer before applying the final coat. While priming adds an extra step and cost, it is a worthwhile investment for a durable, long-lasting finish. For best results, also use a paint specifically designed for metal.