File Name: paint problems and solutions .zip
By studying paint defects, you can identify possible causes in the workshop or garage and help find solutions to avoid such problems in the future. With this in mind, we decided to try and put together a bit of a primer no pun intended referencing some of the most common paint problems many of us have or will encounter during the course of any paint job or jobs. Identification: Appears as a small crater-like opening in the finish after it has been applied. Appear either during or shortly after you lay down a coat of paint or primer though primer is often much more forgiving.
paint problems and solutions pdf
Moisture seeping into the home through the exterior walls less likely with acrylic paint. Exposure of acrylic paint film to high humidity or moisture shortly after paint has dried, especially if there was inadequate surface preparation. If blisters go down to the substrate: Remove the source of moisture, if possible. Repair loose sealant; consider installing vents or exhaust fans. Remove blisters as above, remembering to prime before applying the top coat. Undesirable sticking together of two painted surfaces when pressed together e.
Use of low quality semigloss or gloss paints. Low quality paints can have poor block resistance, especially in warm, damp conditions. Follow paint label instructions regarding dry times. Acrylic paints generally have better early block resistance then vinyl acrylic paints or alkyd or oil-based paints; however, alkyds develop superior block resistance over time. Application of talcum powder can relieve persistent blocking. Increase in gloss or sheen of paint film when subjected to rubbing, scrubbing or having an object brush up against it.
Frequent washing and spot cleaning. Objects furniture, for example rubbing against the walls. Use of lower grades of paint with poor stain and scrub resistance see Poor Stain Resistance and Poor Scrub Resistance. In high traffic areas, choose a semigloss or gloss rather than a flat sheen level.
Clean painted surfaces with a soft cloth or sponge and non-abrasive cleansers; rinse with clean water. The splitting of a dry paint film through at least one coat as a result of aging, which ultimately will lead to complete failure of the paint. In its early stages, the problem appears as hairline cracks; in its later stages, flaking occurs. Overthinning or overspreading the paint.
Inadequate surface preparation, or applying the paint to bare wood without first applying a primer. Excessive hardening and embrittlement of alkyd paint as the paint job ages. If the flaking occurs in multiple layers of paint, use of a filler may be necessary. Prime bare wood areas before repainting. Use of a top quality primer and top coat should prevent a recurrence of the problem.
Formation of bubbles foaming and resulting small, round concave depressions cratering when bubbles break in a paint film, during paint application and drying. Use of low quality paint or very old acrylic paints. Applying especially rolling paint too rapidly. Use of a roller cover with wrong nap length.
Excessive rolling or brushing of the paint. Applying a gloss or semigloss paint over a porous surface. SOLUTION: All paints will foam to some degree during application; however, higher quality paints are formulated so the bubbles break while the paint is still wet, allowing for good flow and appearance.
Avoid excessive rolling or brushing of the paint or using paint that is more than a year old. Apply gloss and semigloss paints with a short nap roller, and apply an appropriate sealer or primer before using such paint over a porous surface.
Problem areas should be sanded before repainting. Appearance of a denser colour or increased gloss where wet and dry layers overlap during paint application. Use of a low solids "economy" paint.
This technique brushing or rolling from "wet to dry" rather than vice versa will produce a smooth uniform appearance. It is also wise to work in manageable size areas; plan for interruptions at a natural break, such as a window, door or corner. Using a top quality acrylic paint makes it easier to avoid lapping problems because higher solids pigments and binder content makes lapped areas less noticeable. Alkyd paints generally have superior wet edge properties.
Use of an alkyd or oil-based paint, or lower quality acrylic paint. Failure to prime bare wood surface before applying the paint. Painting over a substrate or coating on which mildew has not been removed. Remove all mildew from the surface by scrubbing with a diluted household bleach solution one part bleach, three parts water , while wearing rubber gloves and eye protection.
Rinse thoroughly. Consider installing an exhaust fan in high moisture areas. Paint applied too thickly, to improve inherent poor hiding coverage of a lower quality paint. Paint is allowed to build up in corners upon application.
Prime and repaint, using a top quality acrylic paint. Mud-cracked areas can also be repaired by sanding the surface smooth before repainting with a top quality acrylic paint. This type of paint is likely to prevent recurrence of mud cracking, because it is relatively more flexible than alkyd paint, oil-based paint and ordinary acrylic paint.
Quality paints have a higher solids content, which reduces the tendency to mud crack. They also have very good application and hiding properties, which minimise the tendency to apply too thick a coat of paint. An effect of non uniform colour that can appear when a wall is painted with a roller, but is brushed at the corners. The brushed areas generally appear darker, resembling the "frame" of a "picture. Picture framing can also refer to sheen effects. Brushing will generally result in lower spread rates than rolling, producing a thicker film and more hiding.
Adding colourant to a non tintable paint or using the wrong type or level of colourant, resulting in variation in colour, depending on method of application.
Don't cut in the entire room before roller coating. Work in smaller sections of the room to maintain a "wet edge. Factory colours, as well as in-store tints, should be thoroughly shaken at time of sale. Failure of paint to dry to a smooth film, resulting in unsightly brush and roller marks after the paint dries. Re-brushing or re-rolling partially dried painted areas. Use of the wrong type of roller cover or poor quality brush.
Brush and roller marks thus tend to "flow out" and form a smooth film. When using a roller, be sure to use a cover with the recommended nap length for the type of paint being used. Use of a high quality brush is important; a poor brush can result in bad flow and leveling with any paint.
Use of an improper combination of tinting base and tinting colour. Use of a paint that is much lighter in colour than the substrate, or that primarily contains low-hiding organic pigments.
Application of paint at a higher spread rate than recommended. Use a top quality paint for better hiding and flow. Use quality tools; use the recommended roller nap, if rolling. Follow manufacturer's recommendation on spread rate; if using tinted paint, use the correct tinting base. Where a low-hiding organic colour must be used, apply a primer first. Use of a lower quality paint. Use of an overly aggressive scrub medium see Burnishing.
Inadequate dry time allowed after application of the paint before washing it. High traffic areas may require a semigloss or gloss paint rather than a flat paint to provide good scrub resistance. Allow adequate dry time, as scrub resistance will not fully develop until the paint is thoroughly cured. Typically, this will be one week. Try washing the painted surface with the least abrasive material and mildest detergent first. Failure to properly prime a porous surface, or surface with varying degrees of porosity.
Poor application resulting in lapping see Lapping. Without the use of a primer or sealer, a second coat of paint will more likely be needed. Make sure to apply paint from "wet to dry" to prevent lapping. Often, applying an additional coat will even out sheen irregularities. Application of paint to unprimed substrate. SOLUTION: Higher quality acrylic paints contain more binder, which helps prevent stains from penetrating the painted surface, allowing for easy removal.
Priming new surfaces provides maximum film thickness of a premium top coat, providing very good stain removability. Use of lower grades of paint. Use of low quality roller. Use of incorrect rolling technique. Use quality roller to ensure adequate film thickness and uniformity. High quality paints tend to roll on more evenly due to their higher solids content and leveling properties. Pre-dampen roller covers used with acrylic paint; shake out excess water.
Don't let paint build up at roller ends. Begin rolling at a corner near the ceiling and work down the wall in three- food square sections. Spread the paint in a zigzag "M" or "W" pattern, beginning with an upward stroke to minimise spatter; then, without lifting the roller from the surface, fill in the zigzag pattern with even, parallel strokes.
paint problems and solutions pdf
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Januaris is a professional painter and author of painting guides. He has been painting houses and other structures for more than 13 years. There are many factors that can cause paint to peel off your walls, floors, or ceiling. Here are a few. Peeling paint significantly lowers the attractiveness of a building.
Streaks not drips or paint streaks often occur when water-soluble ingredients are pulled from the paint and run down the wall. Posted by Mike Bonner. Most common among interior painting problems. Short-term solutions are using oil absorbent media inside of bag filters, increasing the pigment to binder ratio and in some severe cases diluting the contaminant with fresh feed.
Moisture seeping into the home through the exterior walls less likely with acrylic paint. Exposure of acrylic paint film to high humidity or moisture shortly after paint has dried, especially if there was inadequate surface preparation. If blisters go down to the substrate: Remove the source of moisture, if possible.
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