What is the difference between General Finishes Outdoor Oil and Exterior 450 Outdoor Water-based Topcoat?

When comparing General Finishes Outdoor Oil and Exterior 450 outdoor water-based topcoat , there are several key differences to consider:

Application and Protection

Outdoor Oil:

• Penetrates into the wood fibers rather than forming a film on top
• Simpler and quicker to apply - can be sprayed, rolled or brushed on and wiped off
• Provides less overall protection compared to topcoats
• Requires more frequent reapplication, typically annually, dependent on environmental conditions
• Can be used on decks.

Exterior 450 Outdoor Topcoat:

• Forms a protective film layer on the wood surface
• More complex application process, often requiring multiple coats
• Offers superior protection against moisture and UV damage
• Not intended for large horizontal surfaces such as deck.
• Lasts longer before needing reapplication, typically 3-5 years dependent on environmental conditions

Appearance and Maintenance

Outdoor Oil:

• Enhances the natural look of the wood
• Easier to maintain - simply clean and reapply
• May darken the wood slightly

Exterior 450 Outdoor Topcoat:

• Can provide a range of sheens from matte to glossy
• Requires more effort to refinish - may need stripping and sanding

Durability and Longevity

Outdoor Oil:

• Less durable overall, but easy to reapply
• Typically lasts 1-2 years before needing reapplication

Exterior 450 Outdoor Topcoat:

• More durable and longer-lasting protection
• Can last 3-5 years or more with proper care
• Includes UV protection of the film (not the wood) and mildewicides to retard the growth of mold

Composition

Outdoor Oil:

• Contains UV inhibitors and mildewcides
• Organic oil

Exterior 450 Outdoor Topcoat:

• Water-based self-crosslinking polyurethane/acrylic. 
• Often includes UV protection and other additives for durability.

In summary, outdoor oils offer more a straightforward application and maintenance but less protection. In contrast, outdoor topcoats provide superior durability and protection at the cost of more complex application and refinishing processes. Their choice depends on the specific project requirements, desired appearance, and willingness to perform regular maintenance.