Painting over new putty

Discussion in 'Painters' Talk' started by DIYDave., Sep 16, 2014.

  1. DIYDave.

    DIYDave. Screwfix Select

    Hi all;

    As the title says really, replacing a couple of panes in garage door at weekend and just wondered when the putty will be ready to paint over

    Thanks for any info provided
  2. Astramax

    Astramax Super Member

    How long is a piece of string? I leave to skin over for around 5-6 days then u/coat with an oil based paint. Over the summer I had success with Repair Care acrylic putty system, good but expensive at around £10 per tube although goes a long way and a great time saver as can be painted after a couple of hours.
  3. DIYDave.

    DIYDave. Screwfix Select

    Thanks Astra for the speedy reply :)

    Yeah I guess its not possible to say an exact drying time but if your saying paint over once skinned over (5-6 days) then that's good enough for me

    I might have some water based gloss that I'm gonna be giving a try out (never used the stuff before)

    You mention undercoating with oil based, can the water based be used instead ?

    Thanks once again Astra
  4. Mr. Handyandy

    Mr. Handyandy Screwfix Select

    I was always led to believe that putty should be left for 5 or 6 WEEKS before painting(oil-based only).

    Mr. HandyAndy - Really
  5. Astramax

    Astramax Super Member

    The water based paint will not stick to the linseed oil putty, so use acrylic putty if you want to use water based paint.

    Mr H, oh dear, like I'll be back in 6 weeks to finish your window Mrs!!!!!!!!!!!!!
  6. Mr. Handyandy

    Mr. Handyandy Screwfix Select

    Glazing putty is a mix of boiled linseed oil, calcium carbonate and probably other additives that remain the secret of the conspiratorial, world-dominating putty industry. It is mixed at the factory to a consistency that can be worked to a smooth surface without excessive sticking to the tool, or putty knife. Other putties, such as painter's putty, are chemically similar but often have a creamier consistency more suited to exterior hole filling. They are stickier and thus are difficult to use for window glazing.
    Predating caulk by decades, window putty was designed to make a seal between dissimilar materials (glass and wood), to remain flexible for a long time, and to be paintable. This is a tall order, to say the least!
    Putty's slow drying time is a byproduct of the way it dries, which is oxidation. The linseed oil reacts with oxygen in the air to harden the putty. Once the surface hardens slightly, called "skinning," the rate of drying decreases as the source of oxygen is diminished.

    Putty that is painted very quickly, say within a day of application, may take years to harden since the paint (oil only) will further diminish the supply of oxygen.
  7. Astramax

    Astramax Super Member

    Ok, so you had a new book for your birthday!

    Wish someone would diminish your supply of oxygen ;)
  8. Rulland

    Rulland Screwfix Select
  9. DIYDave.

    DIYDave. Screwfix Select

    I'm so pleased I asked the question :eek:

    Its great being the catalyst for a debate.......Set the question then wait for the fallout .....................

    Thanks all
  10. moppylhd

    moppylhd Member

    Don't wait too long or them pesky sparrows will eat it all off.:)
  11. retiredsparks

    retiredsparks Super Member

    I have used Patent knotting to good effect in the past.

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