Sikkens Cetol BL Opaque

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Key benefits
  • Covers blemishes in wood without hiding the natural grain texture
  • Long lasting and more sustainable alternative to traditional opaques.
  • Outstanding covering power and adhesion.
  • Flexible and vapour permeable formulation for added durability.
Technical Information
  • Finish Semi-gloss
  • Coverage 6-12 m²/L
  • Drying Time 1 hour
  • Recoatable 6 hours
  • Composition Water-based
Product Features
  • Excellent Adhesion

Product Description

Cetol BL Opaque has been specially formulated using woodstain technology to give a flexible, paint-like finish, which is an environmentally preferable alternative to traditional paint.

Application Description

Conditions: Do not apply if there is a risk of rain, or when air/substrate temperatures are below 8ºC or above 25ºC during
application or drying periods. Protect from frost and rain until dry. Failure to meet these requirements may adversely
affect the drying, visual quality and durability of the finish.
After applying one coat allow a minimum of 6 hours drying time before overcoating. On new work, where practical the first coat should be applied all round prior to fixing. Pay special attention to exposed end grain, tops and bottoms of doors, and undersides of cills. Where appropriate (e.g. windows and doors), carefully denib the coat using a fine grade nylon abrasive pad or a fine grade (P240 or finer) wet or dry silicon carbide abrasive paper. Remove all dust.
Subsequent coatings should be applied as soon as possible after the previous coat has dried, but no sooner than 6 hours,
in order to provide full protection. In any event this period should not extend beyond three months, otherwise additional
preparation and coating may be necessary. If applied to exterior wood and the contract is of long duration, it is suggested that a further coat be applied prior to hand over to make good any weathering during the construction period.Ensure product is thoroughly stirred before and during application, otherwise sheen and colour variations may be experienced.Cetol BL Opaque is supplied ready for use. Do not thin.For best results use a use a good quality synthetic-fibre brush specifically designed for the application of water-borne products.Apply product in a full flowing coat, laying off in the direction of the grain. Use the minimum number of brushstrokes required for an acceptable finish. Avoid overbrushing, which creates brush marks and produces a poor quality finish.Coating system durability can be improved by use of end grain sealers.Cetol BL Opaque is a two-coat system on most surfaces, however when white or pale colours are being applied over a black or dark substrate, a third coat may be necessary.

Technical & Safety Documentation

Tips & Advice

  • 1. Preparing the Surfaces
    Ensure the timber surface is suitably prepared, clean and dry, with dust, dirt, wax and grease removed, and allowed to
    acclimatise to its end-use environment. The moisture content should not exceed 18% prior to coating.Degrease any exposed bare timber surface by wiping with a cloth dampened with a suitable solvent. Certain timber species
    contain high levels of natural wood extractives or exudates and some softwood can be highly resinous. Resinous deposits should be removed with a scraper. Any remaining residues should be removed using a lint-free cloth dampened with methylated spirits, frequently changing the face of the cloth. Allow solvent to evaporate fully before overcoating. The use
    of both eye and hand protection is strongly advised.We do not recommend the use of “knotting agents” with Cetol BL Opaque, particularly on exterior work, as they are not
    always fully effective in “sealing in” resin and they can impair coating adhesion.
    The strong colour associated with knots in softwood, and generally with hardwood, is the result of natural chemicals known as extractives. Most of these are water-soluble and the colour can migrate into opaque coatings, resulting in discolouration when using light to medium shades of Cetol BL Opaque. The presence of a factory applied base stain or
    primer is no guarantee against the possibility of extractive discolouration. Where there is a risk of it occurring, the use of Cetol BL Primer is recommended to minimise the problem.When filling, only use fillers specifically designed for use with timber. General or all-purpose fillers are not suitable,particularly on external areas, as they cannot cope with timber movement and work loose.
    New Timber : Where a superficial application of preservative to softwood and hardwood is deemed necessary, such as timbers in Durability Class 3 or lower, use Cuprinol Wood Preserver Clear (BP). For Class 4 (in ground contact) and 5
    (marine) use pre-treated wood specific for these conditions. Preservative pre-treatments must be fully dry before the
    application of Cetol BL Opaque. Do not use on substrates which have had water-repellent preservative pre-treatments
    applied. Where possible, the first coat should be applied all round prior to fixing.
    Only use non-ferrous screws, nails and fixings. Base stained/primed : Denib using a fine grade nylon abrasive pad or a fine grade (P240 or finer) wet or dry silicon carbide abrasive paper, in the direction of the grain. Do not break through the surface coating. Remove all dust.
    Note: Where there is localised damage, or deterioration has occurred as a result of exposure of the factory coating for longer
    than 3 months, affected areas should be thoroughly sanded back to a sound substrate.All damaged or decayed timber must be removed and replaced, cutting at least 25mm into sound timber. When splicing in new sections consider whether the timber species natural durability is sufficient. Brush apply two coats of Cuprinol
    Wood Preserver Clear (BP) to saturation. Thoroughly treat timbers, especially end grain sections, and ensure they are fully dry before splicing in. Secure with non-ferrous fixings and fill all voids surrounding the spliced-in area with a suitable repair compound such as Dry-Flex from Repair Care
  • 2. Cleaning
    Brushes should be cleaned immediately after use with warm, soapy water, and then rinsed thoroughly with clean water. If spilled,Cetol BL Opaque may be removed immediately while still wet,using warm,soapy water
  • 3. Storing
    Store in cool, dry, frost-free conditions
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