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UV protection coating - secret inscription

chomin Member

Hello everyone!
I am looking for a coating which would help me execute a concept ilustrated in the picture.
It is about application of an UV filter (or something else) over a stencil with text. Then put this piece of wood under the sun and capture the process of a darkening of a wood where the uv filter is not applied.
However, it is necessary that initially (before illumination) you cannot recognize where the filter is applied.
The result would be revealing of a "secret inscription" after some time.

The object with that use will be situated in interior.

For now I tried to apply some matte transparent stain (glaze) with UV protection over stencil, but i can easily see the difference between treated and non treated wood. (of course!). - treated is little bit darker and glossy (although is should be matte). And also after sun, the uv protection coating did not stop darkening at all.
So i tried again apply the same stain over stencil, then i treated whole wood plate with stain without UV protection. I can berely see where the UV is applied (good!), but the result after sun is again bad - the part with UV came to dark as well. :(
Maybe it is because bad stain with UV protection. but I tried two different kinds of them.
Now i am thinking about

I am open and glad for any ideas how to make it. Thanks a lot!

View higher quality, full size image (865 X 669)

1/19/15       #2: UV protection coating - secret insc ...

i did this before, but not quite how you describe it. How i did it was i taped off the entire piece. Drew the lettering on with a pencil. cut it out with a razor, exposing only the wood inside the letters. Then i sprayed a coat of vinyl sealer that has uv absorbers. remove tape,scuff lightly spray a coat of lacquer, scuff lightly, recoat. Continue until the surface is smooth and you cant see the film thickness difference from where the vinyl sealer was.

1/19/15       #3: UV protection coating - secret insc ...
chomin Member

thank you Kevin for a response,

did you achieve a noticeable color difference between uv coated and non uv coated wood after a sun bath?

do you remember what kind of a sealer and a laquer exactly did you use?

1/20/15       #4: UV protection coating - secret insc ...

yes. the wood didnt discolor as much as the part that wasnt sealed.

and no, i cant remember the exact product the sealer was. i tried a few different ones before i found one that worked. if i had to take a guess i would say it was Sherwin williams T67F6 sealers and T77F38 pre cat lacquer

1/20/15       #5: UV protection coating - secret insc ...
Paul Snyder  Member


Chomin - you are on the right track - you need to block the UV where the stencil/frisket is, but not the rest of the wood.

The easiest solution I can think of is to use Ciba 1198 on the bare wood (as long as the wood is a light color like the example in your photo). I'm attaching a data sheet that describes this direct-to-wood photo stabilizer. Contact your local coatings suppliers to find a source.

Don't use an oil-base varnish over this product - it may prevent it from curing properly.

Click the link below to download the file included with this post.


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