Creating a lime paint for exterior use is straightforward. Start by mixing hydrated lime and water to achieve the desired paint consistency. Various ratios are suggested depending on the desired effect:
Different Approaches to Mixing Lime Paint:
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Method 1 (Simple Mix): Begin with 500ml of water and one cup of hydrated lime. Thoroughly mix, adding more water or lime as needed to reach a paint-like consistency. Avoid making it too thick, as it will become putty. Remember your proportions for future batches. [Source 1]
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Method 2 (1:3 Ratio): Use a ratio of one part limewash to three parts water as a starting point. Adjust the ratio based on your desired coverage and opacity after testing a small area. [Source 2]
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Method 3 (80/20 Ratio): Mix 80% water and 20% hydrated lime. This provides a good balance for many applications. [Source 3]
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Method 4 (More Complex Recipe): For a more involved approach, consider a recipe with alum salt, natural colorants, lime putty or hydrated lime powder, and water. A potential ratio is 1 part alum salt : 1 part natural colorant : 10 parts lime putty/hydrated lime powder : 20 parts water. [Source 5]
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Method 5 (Earth Pigments Recipe): This recipe uses 6 quarts of water, 1 kilo of hydrated lime, and up to 500g of an earth pigment like ochre. Additives may also be included. [Source 7]
Important Considerations:
- Hydrated Lime: This is a crucial ingredient and readily available at most hardware stores.
- Consistency: Achieving the right consistency is key. Too thick, and it's putty; too thin, and it lacks coverage.
- Testing: Before applying to the entire surface, always test your mixture on a small, inconspicuous area to check the color and coverage.
- Suitable Surfaces: Lime paint works best on masonry surfaces like brick, render, and cement. [Source 6]
Remember to always prioritize safety when working with lime. Wear appropriate protective gear, including gloves, eye protection, and a respirator.
