Oxalic Acid Crystals
Overview
Oxalic Acid for Wood is AG Woodcare’s premium solution for reviving and maintaining wood’s natural beauty. It’s particularly effective in tackling moisture-related discolouration and rust stains. Its capability to refresh faded wood colours makes it a must-have in wood furniture refinishing. The ease of use of Oxalic Acid Cleaner makes it suitable for both professional and DIY projects, mirroring compounds found in everyday household items.
Preparation
Thorough preparation for the application of oxalic acid is essential for optimal application:
- Solution Preparation: Mix approximately 60 grams of Oxalic Acid Crystals per litre of water to create a saturated solution. The solution is ready when a small amount of undissolved sediment remains at the bottom. Adding more crystals does not increase the solution’s strength.
- Alternative Solvent: For quicker drying and re-coating, consider using Methylated Spirits instead of water.
Application
Follow our how to use Oxalic Acid effectively guide for optimal application.
- Solution Preparation: Mix Oxalic Acid Crystals with water following the recommended guidelines to create a saturated solution. Remember, increasing the amount of Oxalic Crystals doesn’t increase the solution’s strength.
- Application Method: Apply the solution using a brush to the affected areas. The bleaching action typically continues for 1-2 hours, with noticeable changes often occurring within 20-30 minutes.
- Multiple Applications: Depending on the severity of the stains, multiple applications may be necessary to achieve the desired results.
- Versatile Application: Oxalic Acid is not just for wood; it is also an efficient rust stain remover for concrete and metal surfaces.
- Neutralising and rinsing: To stop the bleaching action and neutralise any residual acid, wash the treated surface with either methylated spirits or water. If using methylated spirits, rinse with water after before allowing to dry.
- Drying and Sanding: Allow the wood to dry before sanding. Sand down the raised grain with medium-grade finishing paper to ensure a smooth surface for subsequent wood staining, as stains may appear darker on raised grain areas.
Frequently Asked Questions
Who can buy Oxalic Acid?
Oxalic Acid crystals are now classified as a regulated poison, therefore, oxalic crystals are no longer available for sale to the general public.
If you are a business or a professional user, you can still purchase Oxalic Acid crystals providing that you confirm you are a business or professional user.
What types of stains can Oxalic Acid remove?
Oxalic Acid is highly effective at removing iron and rust stains, tannin stains, and watermarks from wood surfaces. It can also be used to clean and restore stone, concrete, and metal surfaces.
Is Oxalic Acid safe to use on all types of wood?
Oxalic Acid is generally safe for use on most hardwoods, including oak, mahogany, and teak. However, it is always recommended to test the solution on a small, inconspicuous area first to ensure it doesn’t affect the wood’s colour or texture.
Can Oxalic Acid be used on exterior wood?
Yes, Oxalic Acid is effective on both interior and exterior wood surfaces. It’s commonly used for restoring outdoor furniture, decks, and other wood exposed to the elements.
How should I store Oxalic Acid crystals?
Store Oxalic Acid crystals in cool, dry place, away from direct sunlight and out of reach of children and pets. Make sure the container is tightly sealed to prevent moisture absorption.
What precautions should I take when using Oxalic Acid?
Always wear protective gloves, eyewear, and clothing when handling Oxalic Acid. Ensure the work area is well-ventilated. Avoid contact with skin and eyes, and do not inhale the fumes. If accidental contact occurs, rinse immediately with water and seek medical attention if necessary.
Can Oxalic Acid be used in combination with other cleaning products?
Oxalic Acid should not be mixed with other cleaning products, especially those containing bleach or ammonia, as this can produce toxic fumes. Always use Oxalic Acid on its own and rinse thoroughly before using any other cleaning agents.
Is Oxalic Acid environmentally friendly?
While Oxalic Acid is biodegradable, it is still a potent chemical and should be used with care. After use, ensure that the solution is neutralised and disposed of properly, following local regulations.
How does Oxalic Acid compare to other wood bleaches?
Oxalic Acid is often preferred over other wood bleaches like chlorine or hydrogen peroxide because it is gentler on the wood and doesn’t alter the wood grain. It specifically targets iron-based stains, making it highly effective for certain types of discolouration.
Can Oxalic Acid wood bleach remove mould or mildew from wood?
Oxalic Acid can help lighten the stains left by mould, but it is not a fungicide. For mould removal, it is recommended to use a dedicated mould remover first, then use Oxalic Acid to treat any remaining discolouration.
How long does Oxalic Acid solution last once mixed?
The oxalic acid solution is most effective when used immediately after mixing. However, it can be stored in a sealed container for a few days, but its potency may decrease over time.
How long does it take for Oxalic Acid to work on wood?
Oxalic acid typically shows noticeable changes on wood within 20-30 minutes of application. The bleaching action continues for about 1-2 hours. Depending on the severity of the stains, multiple applications may be required.
Is Oxalic Acid the same as vinegar?
No, while they are both acids, oxalic acid is much stronger than vinegar so it will be more effective at reviving and cleaning wood than at-home remedies.