confusion regarding priming rabbets
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Jane Stevenson



Joined: 28 Sep 2018
Posts: 4
Location: Madison WI

PostPosted: Mon Nov 05, 2018 11:58 am    Post subject: confusion regarding priming rabbets Reply with quote

I have been reading lots on this forum about glazing and have read different things that have left me confused. Unless I am reading things wrong, I have read that the rabbet should be painted first with an oil based primer and I have read that the wood should not be primed because the oil from the primer will inhibit the oil from the putty to properly bond with the wood. I understand there are differences due to products and situations but I am trying to figure out what to do. to PRIME or NOT TO PRIME before glazing.
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johnleeke
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Joined: 20 Aug 2004
Posts: 2946
Location: Portland, Maine, USA

PostPosted: Tue Nov 20, 2018 10:40 am    Post subject: Reply with quote

Hi Jane, and welcome to the Forum.

Out of confusion arises understanding!

First, understand that the glazing rabbet needs to have some kind of treatment, or the bare wood will absorb some of the linseed oil from the putty possibly causing the putty to loose adhesion with the wood of the rabbet.

There are three treatments that can do this:

1. Traditional: use boiled linseed oil. This works well, but may require a few or several days to soak in and begin to dry. Once the oiled wood surface is tacky, it's OK to glaze in the glass pane.

2. Modern: use a commercial product like Flood's "Penetrol." This will soak in quickly and begin to dry right away, and be ready for glazing the next day.

3. Shortcut: If the rest of the sash has to be primed before glazing, then simply priming the glazing rabbet at the same time can be expedient. In some cases this may work well, but there is the possibility that the putty may not adhere to the primer as well as linseed oil or Penetrol.

Best practice is to use 1. or 2. above.

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Jane Stevenson



Joined: 28 Sep 2018
Posts: 4
Location: Madison WI

PostPosted: Tue Nov 20, 2018 10:59 am    Post subject: Reply with quote

Thanks so much that clears things up!
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