Whether to brush or roll stain on wood depends on the project and your preference. Brushing is ideal for smaller, intricate areas and offers more control over the application, ensuring thorough coverage and penetration into the wood's grain. 

Conversely, rolling is efficient for more extensive, flat surfaces and can save time. However, it is not always the best fit for textured or uneven wood. Some projects may benefit from combining both methods, using a brush for detail work and a roller for broader areas. Ultimately, the choice between brushing and rolling depends on the specific requirements of your staining project.

The best type of paint for concrete exterior surfaces like concrete porches, steps, or walkways is high-quality exterior-grade paint with strong weather resistance. Acrylic latex blends with tiny anti-slip particles will help create an anti-slip coating for your concrete porch. This type of paint will stand up best to the elements, especially rain, snow, and ice. An exterior epoxy will also help strengthen your concrete porch.

You don't need to seal your deck after painting it because most exterior paints are waterproof and weather-resistant. While stealing is not necessary, it can add an additional layer of protection.

In most cases, sanding an old deck before staining it is necessary to achieve a decent finish. If your old deck has a relatively new stain finish on it and you're only doing touch-ups, you can generally skip the sanding part. However, if your goal is to make the deck look and function better, sanding first is a must.