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What is the best product to re-paint external stone windowsill

I live in a back to back victorian terrace.
It has stone windowsills/ lintels that need sanding and re-painting.
The old black coloured paint is bubbled and falking away.
The lintesl are in great condition and just need re-painting.
What do i re-paint them with?
What is the best product please?
I'd like it in keeping with the original stone which is a cream ish colour?

Many thanks

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  • star_anise15 Jan 10, 2009

    Thanks so much Michael.

    Wish you were living near me, would have paid you for the advice, its fab!

    I've come across a waterproof paint called bichumen, in black would that be any good?

  • Anonymous Jan 11, 2009

    Thanks so much x

  • Allen Neal
    Allen Neal May 11, 2010

    metal or wood

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As any good stone mason knows, painting stone is NOT RECOMMENDED!  Stone has a natural beauty and durability that cant really be improved upon.  Its my opinion that paint on stone or brick usually looks horrible.  Especially when the paint gets old and begins to deteriorate.  Stone is a natural material used in building for thousands of years.  It is strong, durable, insulating from heat and cold and allows the structure to "breathe" while keeping out moisture and preventing condensation.  Painting stone stops its ability to "breathe" and effectively closes its pores, which can cause condensation inside walls, break down the stone's surface molecules and premature erosion.       I would recommend power washing or sand blasting the surface to remove the old paint.  Then carefully apply a waterproofer / sealant made for exterior use and stone in particular.  This will protect your stone window sills and lentils from harsh elements like acid rain, bird poop and ice while  allowing the structure to breathe and look beautiful naturally for decades to come.    I would not recommend sanding as this might change the surface of your stone and leave unsightly scratches and uneven surfaces.    You can look online for solutions by googling "stone waterproofing" and "stone cleaning" before deciding what is best for you.  I highly recommend NOT painting exterior stone.  Here are a few helpful results I have found.
http://www.hytechsales.com/prod52.html

http://www.tonygraham.co.uk/paint_remove_house.htm


http://books.google.com/books?id=gs6Fu-OUhRIC&pg=PA81&lpg=PA81&dq=paint+removal+for+stone&source=bl&ots=VtQHht57iq&sig=He1aHsOMYpW1aU4mxuStkJgrH7E&hl=en&sa=X&oi=book_result&resnum=4&ct=result#PPA79,M1


Wishing you the best results and an easy job!   Michael Mittelsdorf




Posted on Jan 10, 2009

  • Michael Mittelsdorf
    Michael Mittelsdorf Jan 11, 2009

    Dear Star_Anise,
        Thank you for your kind words.  Bichumen is also known as "blacktop" it is black because it is  the type of tar used to coat and seal asphalt roads.  I don't think this is what you want.  Your beautiful cream colored window sills would be ugly black and sticky in the summer heat.  I would go with a clear waterproofing that specifically is for stone.  Bichumen is for tarring roofs and painting roads.
                               Please feel free to ask away as much as you need.  Michael  

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