Dulux Trade Weathershield Exterior Preservative Primer+ (BP)

Dulux Trade Weathershield Preservative Primer+ (BP) penetrates deep into wood to seal and protect it against water damage, decay and blue stain fungi. It provides 8 year weathering durability when used as part of the full Weathershield exterior paint system.

The light green tint of the preservative helps users to detect which areas the primer has been applied to during application but dries clear within 2 days.

To get the best results, ensure surfaces to be painted are sound, clean and dry (new surfaces particularly must be fully dry), and free from any dust, dirt or other surface contaminants.

1. Remove all loose and defective coatings, if necessary stripping back to bare wood
2. Remove and treat any mould, algae, lichen or moss with a suitable mould and mildew cleaner
3. Remove defective glazing material, clean the rebates and any loose or open joints
4. Replace any rotten wood and troublesome knots with new timber
5. Thoroughly rub down all surfaces to remove any grey, weathered wood and surface sheen from remaining coatings, and then dust off (refer to your COSHH Assessment)
6. Apply 1 or 2 coats of an appropriate knotting solution to any remaining knots
7. Fill any surface defects, open joints etc. with an appropriate filler and replace any missing glazing material with a suitable glazing compound

Please Note: New joinery is often factory primed using a stain basecoat (also called a dual-purpose primer). These materials quickly erode when left exposed and may need to be re-primed. Special precautions should be taken during surface preparation of pre-1960s paint surfaces over wood as they may contain harmful lead.

Always do a test area before starting any project to assess product suitability and finish. Follow the manufacturer's instructions on the tin at all times. This product should be brush applied only, do not spray.

Initial Procedure

1. Mix the Weathershield Preservative Primer+ (BP) thoroughly by shaking the container
2. Pour out a sufficient amount of primer for the job into a suitable container
3. Do not use direct from the can or return any unused primer to the container
4. Do not thin

Application

1. Prime all bare wood with 2 coats of Weathershield Preservative Primer+ including any new or bare replacement beading
2. Apply a second coat as soon as the first coat has soaked in. This typically takes 2-6 hours
3. Do not allow the first coat to fully dry before applying the second coat, as this will reduce penetration into the wood and prolong the total drying time
4. Allow 16 hours for the second coat to dry
5. Excess primer should be wiped off surrounding paintwork
6. Allow a minimum of 16 hours before overcoating with the Weathershield paint system

Please Note: When painting resinous wood or woodwork with a history of blistering it is advisable to use light colours only, particularly on south facing elevations. The maximum benefits of this system will only be realised when used as directed above on good quality timber that conforms to BS EN 942: 2007, in conjunction with good component design.

Once dry, Dulux Trade Weathershield Exterior Preservative Primer+ (BP) should be finished with the Weathershield system in the following manner:

1. 2 coats of Dulux Trade Weathershield Quick Dry Exterior Undercoat to all treated wood
2. Follow up with 1 coat of Dulux Trade Weathershield Exterior High Gloss or Dulux Trade Weathershield Quick Dry Exterior Paint