Yes, you can DIY seal both concrete & asphalt surfaces, but it requires specific tools, precise weather conditions, and physical labor. While DIY sealing saves on labor costs, hiring a professional ensures commercial-grade durability and eliminates the risk of application errors.We see over sealed driveways all the time and the only way to fix an oversealed concrete surface (like the one below) is to sandblast the excess sealer off. This ends up costing a lot more money over the long run.