How To Get Paint Off Stone
Graffiti While you are generally advised to remove graffiti as soon as possible to prevent further vandalism, you should seek advice from your local council on how to do this as you may further damage the stone work.GraffitiJohn Gilbert Removal advice to avoid further damage to stone Should we remove paint from stoneware? However, paint can prevent the stone from breathing, causing damage to the stone.
- the stone may have been painted to cover old repairs – removing the paint can leave a bad look
- Paint can prevent rain from penetrating very porous stone
- Painting may be the traditional style in your area – paint removal may require plan approval
- Paint removal from listed buildings or in protected areas requires consent
- Removing paint will always cause some damage to the stone – do a patch test first.
- Paint removers can be hazardous to health and lead paint is hazardous waste
- Paint can be extremely difficult to remove from porous rocks, especially where thick historical paints have been used.
If your building has a border (rendering) it is important to keep the border painted. This will cover the hairline cracks, allowing moisture to seep in behind the frizz causing the hair to break. Use specialized breathable paints available from lime suppliers and other sources. Some types of harling are self-colored and unpainted. Paint Removal Method Always start with the least harsh method. Use a properly qualified professional to do the job for you.
John Gilbert Paint Removal Patch Test Always make sure no damage is done to the stone Here are the methods you can use, starting with the least aggressive and working as hard as possible:
- weather: let nature take its course and allow the paint to deteriorate naturally – but an intermediate look may not be acceptable
- water wash: including gentle scrubbing or scrubbing with a soft-bristled brush can be effective on emulsions, lime water, and other very old, flaking paints.
- steam stripping: Superheated low-pressure steam stripping for water-diluted paints, such as emulsions, that can clean without saturating the stone surface
- Solvent chemical detergent (non-caustic): Water-soluble cleaners should be considered before using methylene chloride-based solvents – they are best suited for removing oil- or latex-based paints, but may not be as effective with others
- alkaline chemical cleaners (caustic) eg caustic soda or potash: these can be particularly damaging to stoneware and can be absorbed by porous stone, where the damaging effects can persist afterwards. Avoid unless immediate or ongoing damage to the stonework cannot be demonstrated. Chemical cleaners should be thoroughly washed off the stone afterwards to avoid leaving residue
- manual abrasive: Shaving, sanding, wire brushing or other aggressive manual cleaning can cause significant damage to the stone
- mechanical wear: Cleaning with high-pressure water, sandblasting, or grit can also cause significant damage to stonework, making stonework more susceptible to weathering and loss of architectural details.
Read more: How to keep couch cushions from slipping Whatever method you use, it’s generally a good idea to let the particularly stubborn paint rest and weather naturally to avoid damaging the stonework or thread. Such failures can lead to more costly repair or re-appointment needs. Recommend professional help? Although the job may seem simple, make sure your mason or mason has the skills for the job. If there is any doubt, get the help of a specialist to designate and organize a repair. Who pays? Paint removal is normal maintenance and repair. Painting murals for purely decorative reasons is an improvement.
More information
Scottish Historical Information Guide ‘Cleaning Sandstone: Risks and Consequences’Historic Scotland how-to information’ Graffiti and its safe removal’Read more: how to clean leather wallets from thrift stores | Q&AHistoric Scotland’s premier informative guide ‘Gracefully clean old stone’Historic Scotland’: A Practitioner’s Guide to ‘Directive Memorandum of Listed Buildings and Reserves in Scotland’Read more: how to remove bubbles from window colorRead more: how to remove bubbles from window color
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