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Fenestra Old World Finish - Interior

A gypsum-based plaster finish specially designed to provide color effects and various finishing styles on interior surfaces.

Product Information

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Fenestra is a traditional gypsum-lime plaster specially designed to provide color & depth effects for interior surfaces. Fenestra is applied over a sealed and bonded gypsum surface. Fenestra may also be applied up to 3/8” in a single pass and be used for repair and restoration of traditional or veneer plasters.  Colors and visual effects are created by broadcasting Fenestra mixed with accent color(s) on the surface of the colored wet plaster and by the types and methods of troweling.


Fenestra is packaged in 50 lb / 22.67 kg bags.

Fenestra may be applied over sealed, bonded, gypsum hard wall plasters or gypsum wallboards.

Two coats of Fenestra will cover approximately 120 square feet per 50 lb bag.

Applications and Tools: 


Substrate and Surface Preparation:
Gypsum wallboards must be brought to a Level 3 surface. 
Larsen Product Corp, Plaster Weld is applied over the surface. Assure the surfaces are free of dust, dirt or other contaminants that may affect sealing and adhesion.

Pour 2.75 gallons of potable water (avoid warm water – it will accelerate set time.) into a clean 5-gallon pail.  Pour part of the bag of Fenestra into the water and the color pack for the base color - and begin mixing with a Windlock type paddle mixer.
Add the additional Fenestra from the bag to the water and continue mixing. After the entire contents of the 50 Lb bag of Fenestra has been added – continue to mix an additional 1 to 2 minutes.

Plaster Application:
Apply Fenestra with a hawk and trowel.  Apply first coat at a 1/16” to 1/8” providing a level surface for the second coat. Second coat is applied over the first coat at approximately 1/8”.  To apply the second coat the water droplets and wet sheen must be off the first coat.  The first coat however must be damp and cool to the touch. 
Sufficient manpower must be available to bring plaster both vertically and horizontally to natural breaks avoiding cold joints. The second coat is applied uniformly over the surface - but at this point all trowel lines and imperfections do need to be troweled out.

Second coat of Fenestra is ready for polishing when the sheen is reduced and no color remains on the fingertips after lightly touching the surface of the colored plaster.  (If color or plaster material is building up on trowel surface stop polishing immediately – and wait additional time until surface is ready.)  Hard Trowel (Item 2) the plaster surface until achieving a polished 'glass' finish.

Wax Application:
Rialto Wax is recommended to use with Fenestra.  Do not wax Fenestra until 24 hours after polishing second coat. A Pavan type trowel or a clean 100% cotton cloth (white recommended) may be used to apply wax coatings to Fenestra.  After a tight coat of wax has been applied to the surface and allowed to dry thoroughly – polish wax with an orbital buffer.

Gypsum plasters require stable temperatures and ventilation during application and during the period of time required for the plaster to dry. The required temperature range for the application and drying of gypsum plaster shall be 55°F to 80°F.

Fenestra shall be kept indoors or if stored outdoors, shall be adequately covered to keep dry and be stored off the ground.

Do not apply in rooms with high moisture conditions. Do not apply when surface or ambient temperatures are below 40°F / 4.4°C or above 100°F / 34°C. Do not apply to surfaces that are contaminated with bond breakers, oils, or other matter that may affect the performance of the product. Do not apply if conditions are expected to be above or below the specified temperature ranges within 24 hours of application. Do not add additional ingredients to California One-Kote without specific written approval from an authorized manufacturer of California One-Kote.

Shelf Life:
6 Months.  


Manufacturers of Western Blended Products (WBP) warrant its products to be of merchantable quality and suitable for the general purpose for which they were intended, when applied in accordance with WBP instructions.  Manufacturers of WBP do not warrant its products to be suitable for any purpose or use other than for which they were intended.  Liability under this warranty is limited to supplying new material without charge, or at manufacturers of WBP option, to a refund of the purchase price.  In the event of a claim under this warranty, written notice must be given to the originating plant of the WBP goods at the address shown hereon.  This limited warranty is issued and accepted in lieu of all other expressed warranties, and expressly excludes liability for consequential damages.  Some states do not allow the exclusion or limitation of incidental or consequential damages, or limitations on how long an implied warranty lasts, so the above limitations and exclusions may not apply to you.  This warranty gives you specific legal rights, and you may also have other rights that vary from state to state.

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