House painting projects stir up strong opinions (pun intended), but before you can compare actual paint colors, you need to decide on oil vs. latex. Latex is usually the go-to for interior painting projects, but it's fair to consider oil-based products, too; they bring different benefits to the table.

Oil-based paint will deliver a rich, smooth finish. Some folks think can be a hassle to apply and clean up, which isn't untrue, but its classic durability is impossible to ignore. On the other hand, the convenience of latex-based paint is great, but if it was flawless, it'd be used for every project. 

So which is the best choice? Well, it depends on where and what you’re painting.

Durability and Longevity

Oil-based paint

• Durable. It forms a hard, durable finish that resists wear, tear, scuffs, and scrapes making it a great choice for surfaces that get touched a lot. Therefore, a good paint for trim, doors, kitchen cabinets, and high-traffic areas.
• Potential for slight discoloration. Over time, oil-based products can yellow, especially in rooms with little natural light.
• Long-lasting. Previously the most common paint, it does last for a very long time, only becoming brittle or cracking after much exposure.

Latex paint

• Flexible. Remains flexible after drying, helping to prevent cracking and peeling, especially in areas with humidity or temperature fluctuations.
• Fast-drying (and easy to apply and clean). Water-based paints are easier to touch-up as it's less prone to fading or discoloration and dries faster. They often require two coats of paint.
• Finish isn't as durable (but brands are improving). These types of paint hold up well on walls, ceilings, and areas with less physical contact, though paint manufacturers have made advances in paint technology and have developed a huge array of quality latexes that include more durable options in recent years.

Ease of Application and Cleanup

Both latex and oil paint need some level of prep depending on the type of surface. 

Oil paint is best on metal surfaces and nice woodwork. Oil-based paint dries more slowly, but can cover with just a single coat. The slow dry time gives it a smoother finish with less brush marks. Important note: Cleanup requires mineral spirits or paint thinner that have toxic fumes and call for proper ventilation.

Latex options are used on all types of surfaces. It dries quickly, allowing for faster finished product. This does mean that you'll see more brush strokes and leftover paint will dry out with the introduction of air. It can be used in colder weather (down to 40°). It only requires a soap and water cleanup and any bad fumes fade after a day or so, making it a more convenient choice for indoor projects.

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Maintenance and Long-Term Considerations

Oil-based paint is a durable product that resists stains and moisture well, but cleaning those surfaces may require strong solvents to remove dirt and stains. With fluctuating humidity, it can become brittle and may crack or peel. If the surface is in low light, it tends to oxidize faster so the oil yellows. Touch-ups are harder to do as it's hard to match to any natural discoloration.

Latex paint is more resistant to fading, making it a great choice for well-lit areas. It's common to use latex for walls. It resists mildew growth, so it's great for high-moisture rooms and concrete. Touch-ups and repaints are easier since latex adheres well to existing latex layers without extensive prep work. Many latex paints are washable.

FAQ

Can you paint latex over oil-based paint?

Yes, but surface preparation is important. Start by cleaning the surface thoroughly to remove dirt and grease. Lightly sand the glossy finish to help the new paint adhere, then apply a high-quality bonding primer designed for this transition. Once the primer is dry, you can apply a coat of paint. Skipping these steps increases the risk of peeling and poor adhesion. The opposite, oil over latex paint isn't recommended.

Which paint is better for humid environments?

Latex paint is generally better for humid spaces, so it's a popular choice for bathrooms, kitchens, and basements. There are a wide range of specialized paints with mildew-resistant additives so it's an obvious choice where ventilation is low. It resists moisture and dries quickly, reducing the chance of trapping humidity beneath the surface. Oil-based paint, while moisture-resistant, takes longer to dry and may eventually crack or peel in high-humidity conditions.