If coating combination A were to appear directly beside coating combination D, the variance in texture would not create a visible profile to the naked eye however, it would definitely give the wall a blotchy, patchy appearance as if the wall was painted with the 2 different batches of the same product. Drywall, Filler, Sealer, Intermediate Coat, Filler, Sealer, Intermediate Coat.Drywall, Sealer, Filler, Sealer, Intermediate Coat.Drywall, Filler, Sealer, Intermediate Coat.In the scenario mentioned above, one wall could consist of the following combinations of coatings and filler: To achieve a smooth uniform appearance in a typical 3-coat system, each coat must be applied over a level and even surface. Perhaps the worst part of the scenario described above relates to what happens when drywall repairs are made after the intermediate coat. The painting contractor is only liable for surface defects found AFTER the applying the finish coat, however the scenario above highlights how difficult achieving a quality, uniform finish when painting new drywall is. These newly identified surface irregularities will be need to be repaired by the drywall contractor. Improved lighting makes surface defects in the drywall much easier to see (as well as the application of a higher sheen intermediate coat), and changing the temperature of the exposure environment causes movement in the walls and seams, creating additional defects. As the project moves forward, these systems are set up, both of which can impact the appearance of the drywall. Often, when painting work on new drywall commences, the lighting and heating systems of the finished project have yet to be installed. Ideally, this would be the final step before scuff-sanding the intermediate coat and applying the final finish coat however, this is not always the case. Once repaired, the painting contractor will spot-prime these areas before scuff-sanding the prime-coat in order to prepare the surface for the application of the intermediate coat. The next step from here is to call the drywall contractor back onto the jobsite to repair and fill any deficiencies in the substrate. Read More…Įven with a thorough review of the unpainted drywall surface, it is quite common for “new” surface defects to become visible after the prime-coat has been applied. This occurs because greater light reflectance tends to make surface defects more noticeable and thus the uncoated drywall may have small surface flaws that are practically invisible until some coating is applied. This is because defects in drywall can be very difficult to detect until the prime-coat is applied. This provides a continuously sealed surface with relatively uniform porosity and is the first step required to accomplish an even and smooth finish on new drywall.Īlthough minimizing the variance in porosity is the first step in ensuring an even finish when painting drywall, it often is not the last step. Using a high quality latex primer sealer will help to offset this difference in porosity by sealing the more porous surface joint filling compound and the less porous paper surface. The paper coating is less porous and therefore will absorb paint at a slower rate than the filler compound, resulting in an uneven finish. One of the reasons an even and uniform finish is so difficult to achieve when painting new drywall is due to the variance in texture and porosity between the paper coating and joint filling compounds. While the painter may appear responsible for an uneven or patchy finish, these defects can often be attributed to how the drywall was prepared. Despite its prevalence in the construction industry, achieving a uniform and even finish when painting new drywall can prove challenging. Constructed out of a gypsum-based core with a paper coating on all sides, drywall is the most common interior wall surfacing material used in modern construction.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |