Nisus Tim-BOR Professional Borate Powder Wood Preservative

In this review the Nisus Tim-BOR Professional stands out as a versatile wood preservative for homeowners and contractors who need reliable protection against wood-destroying insects and decay. The single biggest reason to consider it is its flexibility: it can be used as a dust, liquid, or foam to reach visible surfaces and hidden cavities, which makes it useful for both preventive treatment in new construction and remedial work on existing timbers. Practical, non-staining, and formulated from a borate mineral, it appeals to those who want effective control without damaging wood or fasteners.

Key Features

• Multiple application options: Can be applied as a dust, mixed into a liquid solution, or formed into a foam so treatments can penetrate cracks and hidden spaces.
• Protects against wood decay and insects: Designed to prevent damage from dry wood termites, carpenter ants, wood decay fungi and other wood-targeting pests in a range of environments.
• Safe for bare wood surfaces: Formulated not to discolor or stain untreated wood and is non-corrosive to screws, nails and other construction components.
• Recommended for new construction: A 15% liquid solution is suggested for protecting wood in new builds or on untreated lumber, giving a durable preservative layer.
• ECO-friendly formulation: Uses disodium octaborate tetrahydrate, a naturally derived borate mineral that offers sustainable insect and decay control.
• Easy to mix and apply: Customers consistently report good mixability and spray effectiveness when preparing liquid solutions for logs and framing.

Who It's For

This product is ideal for homeowners renovating older structures, log home owners treating exterior or interior timbers, and builders who want a preventive treatment for untreated wood during construction. Its ability to be applied as dust, liquid, or foam makes it especially useful where access is limited or where treating hidden voids and crawlspaces is required.

It is less appropriate for sealed, painted, or varnished surfaces since the directions advise against applying over finishes, and households seeking an immediate knockdown aerosol should look elsewhere. Users expecting a cosmetic finish or treatment compatible with finished furniture should not use it on varnished or painted pieces.

Pros & Cons

Pros

• Versatile application methods allow targeted treatments in open and concealed areas.
• Effective against a broad range of wood pests and decay fungi, backed by user reports of real results.
• Non-staining and non-corrosive, so it preserves wood appearance and fastener integrity.
• Environmentally sensitive borate formulation preferred by users concerned about sustainability.

Cons

• Not suitable for painted, sealed, or varnished wood, limiting use on finished surfaces.
• Requires proper mixing and adherence to label directions; some users may find preparation or repeated treatments necessary for severe infestations.

Specifications

Product name	Nisus Tim-BOR Professional borate powder
Formulation	Disodium octaborate tetrahydrate (water-soluble borate)
Pack size	25 lbs
Application methods	Dust, liquid solution, or foam
Recommended solution	15% liquid solution for new construction
Safe for	Bare, untreated wood; non-corrosive to screws and nails

Our Verdict

The Nisus Tim-BOR Professional is a practical, cost-effective choice for anyone needing long-term protection of untreated wood from termites, carpenter ants and decay fungi. Its multiple application modes and non-staining, non-corrosive formula deliver value for builders and homeowners who want a durable preservative without compromising wood appearance or fastener integrity.

Frequently Asked Questions

Can Tim-BOR be used on finished or painted wood?
Answer: No, the product should be applied to bare, untreated wood only and is not recommended for painted, sealed or varnished surfaces.

What concentration should be used for new construction?
Answer: The label recommends a 15% liquid solution for protecting wood in new construction or on untreated lumber.

Is Tim-BOR corrosive to metal fasteners?
Answer: No, it is non-corrosive to screws, nails and other construction components when applied as directed.