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Protect exterior woodwork

Explore finishes for exterior woodwork and siding, and plan the complete system for your surface. Confirm which products suit vertical surfaces, existing coatings and the exposure before choosing.

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Thunder Bay climate normals, 1991-2020. Environment and Climate Change Canada

Preparation / Products / Advice

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Selections follow this month’s project phase and reviewed product guidance. Confirm the forecast, actual surface conditions and availability before starting.

SDF
Application conditionsManufacturer guidance
Air temperature
Check manufacturer instructions
Surface temperature
Check manufacturer instructions
Ideal temperature
21°C
Rain-free window
24 hours

Manufacturer sheet reviewed: ideal application temperature is 21°C at approximately 50% relative humidity. Do not apply when rain or near-freezing temperatures are expected, on wood warm to the touch or in direct sunlight. Keep the coating free of rain for 24 hours. No hard numeric air or surface minimum/maximum or measured wood-moisture limit is specified. The near-freezing restriction has no stated duration; storage temperatures and reference drying temperatures are not application limits. Cold or humid conditions extend drying.

Manufacturer guidance Reviewed 2026-10-24 · CA
SDF TOPCOAT
Application conditionsManufacturer guidance
Air temperature
Check manufacturer instructions
Surface temperature
Check manufacturer instructions
Ideal temperature
21°C
Rain-free window
24 hours
Protect from freezing
24 hours

Manufacturer sheet reviewed: ideal application temperature is 21°C at approximately 50% relative humidity. Do not apply in the heat of the day or direct sunlight. Rain and near-freezing temperatures must not be likely within 24 hours after application. No hard numeric air or surface minimum/maximum or measured wood-moisture limit is specified. The 10–30°C range in the sheet is for storage. Drying and recoating times depend on conditions.

Manufacturer guidance Reviewed 2026-10-24 · CA
ENS
Application conditionsManufacturer guidance
Air temperature
Check manufacturer instructions
Surface temperature
Check manufacturer instructions

Manufacturer sheet reviewed: do not apply in the heat of the day, in direct sunlight, on wood warm to the touch, or when rain or near-freezing temperatures are expected. No hard numeric air or surface minimum/maximum, ideal application temperature, measured wood-moisture limit or weather-free duration is specified. The 20°C drying reference and storage range are not application limits. Drying is slower in cold or humid conditions; follow the specified penetrating-undercoat system for bare wood.

Manufacturer guidance Reviewed 2026-10-24 · CA
ENS NATURALS TOPCOAT
Application conditionsManufacturer guidance
Air temperature
Check manufacturer instructions
Surface temperature
Check manufacturer instructions

Manufacturer sheet reviewed: use on a clean, dry surface. Do not apply in the heat of the day, in direct sunlight, on wood warm to the touch, when rain is expected, or in freezing temperatures. No hard numeric air or surface minimum/maximum, ideal application temperature, measured wood-moisture limit or weather-free duration is specified. The 20°C drying reference and 10–30°C storage range are not application limits. Cold or humid conditions extend drying.

Manufacturer guidance Reviewed 2026-10-24 · CA
Project research and manufacturer references
Local knowledge / Practical advice

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550 Fort William Road, Thunder Bay

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