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PostPosted: Thu Sep 28, 2017 6:40 pm 
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Hi,
I am looking for some advice for painting over some very old dark wood panelling. It is pine but I am not sure what is on top of it - paint, varnish perhaps.

I thought I could use Zinsser Bin so I followed the instructions by cleaning the surface then using methylated spirit to degrease. However, the methylated spirit caused a clear-ish top layer to go sticky and peel off. The more methylated spirit was added, eventually the whole layer came off and it went back to bare wood.

Below picture shows what happens when a little methylated spirit is applied
Attachment:
File comment: When a little methylated spirit is added. Top layer starts to peel
IMG_6861.JPG
IMG_6861.JPG [ 106.28 KiB | Viewed 392 times ]


Below picture shows what happens when a bit more methylated spirit is added with a little more elbow grease:
Attachment:
File comment: Back to bare wood when more methylated spirit is added
IMG_6860.JPG
IMG_6860.JPG [ 134.98 KiB | Viewed 392 times ]


It was impossible to get just that sticky layer to peel off without the rest coming off and going back to bare wood.

I have a huge area of this panelling so it is going to be very time consuming to completely strip all the area. Any suggestions?

Many thanks


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PostPosted: Thu Sep 28, 2017 6:59 pm 
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Sounds like the wood has been waxed at some point, and it's the wax that's softened by the meths.

You could try using a limbide or cabinet scraper to take off the wax.

The only time I painted over waxed furniture, I went straight on with two coats of zinsser BIN and then oil eggshell. A few years later when I saw the piece of furniture again it was fine.

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PostPosted: Thu Sep 28, 2017 7:56 pm 
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It could also be that it has been stained with water based woodstain. Meths will sometimes act like paint stripper on water based coatings. This happened to me once when I de-greased a handrail with meths and it started dissolving the stain.



For this message the author ian gibson has received gratitude : fitzy
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