Advice on doing a 2Pac Finish

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Originally Posted by ian

if I recall 7008 is designed to go on with a relatively thin wet film. The bulges yiu describe sound like a surface tension effect that might go away if the edges of your piece are "broken" or rounded

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I tried to brush a coat of 7008 straight out of the can as thin as I could (any thinner & it's hard to apply as its dry & doesn't spread easy). Yet this problem still happens. My guess 2pack was never really good on a brush & its mainly for floorboards etc.

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Originally Posted by SPF

Tegmark how did you go sanding and polishing the 7008? The 7008 is pretty good straight off the brush for clarity and shine, but I haven't tried polishing it. I'm keen to see your results, especially if you are doing a broad flat surface.

I'm looking at making a large American oak table in the next couple of months, and am considering either the epoxy and marine PU, or the 7008. I'd like to spray it for even finish, but if the 7008 can be polished, then that would be a quicker and simpler solution.

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Hi SPF,

Just waiting for a week or two more so it really hardens up, as I applied the coats pretty thick. So far I just finished sanding from 400 all up to 2000 through the grits. Seems easy enough as long as new paper is used.

When I polish, Ill post my results. I intend to do a full hand polish & machine. If it's anything like oil based, it should come up very glossy but look more plastic/opaque on certain angles.

Does anyone know if you can 2pack PolyU over water based wood filler? I tried a test piece & it's been a week or more & no issues so far.

Quote:

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Originally Posted by Tegmark

I tried to brush a coat of 7008 straight out of the can as thin as I could (any thinner & it's hard to apply as its dry & doesn't spread easy). Yet this problem still happens. My guess 2 pack was never really good on a brush & its mainly for floorboards etc.

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from the Estapol 7008 Technical data sheet

recommended Wet Film thickness 85 microns ( = 0.085 mm)
recommended Dry Film thickness 38 microns ( = 0.038 mm)


Data sheet http://lpb-dev.azurewebsites.net/Upl...pol%207008.pdf

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Originally Posted by Tegmark

Does anyone know if you can 2pack PolyU over water based wood filler? I tried a test piece & it's been a week or more & no issues so far.

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I have a danish couch frame that I used water based filler on with 7008 over the top. This was done 6 years ago and no problems (except the filler lightened over time and is now obvious).

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Originally Posted by Tegmark

When I polish, Ill post my results. I intend to do a full hand polish & machine. If it's anything like oil based, it should come up very glossy but look more plastic/opaque on certain angles.

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I look forward to seeing the results.

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Originally Posted by ian

from the Estapol 7008 Technical data sheet

recommended Wet Film thickness 85 microns ( = 0.085 mm)
recommended Dry Film thickness 38 microns ( = 0.038 mm)


Data sheet http://lpb-dev.azurewebsites.net/Upl...pol%207008.pdf

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These tech specs are for generic floor boards & not a fine furniture application. Any thickness & the problem happens. As far as I can tell 2pack is only good for spraying.

The recommended wet film thickness for Estapol water based Xtra clear is 83 microns, which is near enough the same as for 7008.
and that for Estapol Moisture Cure Polyurethane High Gloss is 100 microns, which is much thicker.
So I'm wondering if you are applying too thick a coat of 7008 which is leading to your problems.


It might be worth a call or email to Wattyl's technical help line

Quote:

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Originally Posted by ian

The recommended wet film thickness for Estapol water based Xtra clear is 83 microns, which is near enough the same as for 7008.
and that for Estapol Moisture Cure Polyurethane High Gloss is 100 microns, which is much thicker.
So I'm wondering if you are applying too thick a coat of 7008 which is leading to your problems.


It might be worth a call or email to Wattyl's technical help line

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Thanks ian.

I wan't to first try applying coats that are thinned. So I wan't to ask what is the recommended thinning %? 10%, 15%?

I'm going to try 10-15% to see how I go with this problem.

thanks

7008's technical data sheet, suggests 10% as the upper limit for thinning.

also, how cold is it where you are working? Could low temperature be an issue.

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Originally Posted by Tegmark

These tech specs are for generic floor boards & not a fine furniture application. Any thickness & the problem happens. As far as I can tell 2pack is only good for spraying.

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CAUTION

The safety data for Estapol 7008 specifically says -- "Do not apply this product using spray equipment."

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Originally Posted by ian

CAUTION

The safety data for Estapol 7008 specifically says -- "Do not apply this product using spray equipment."

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Many 2pac products need to be sprayed with a grounded gun, and need to have adequate fan forced ventilation - given the purpose of 7008 (floors and timber more generally) it makes more sense to say that it shouldn't be sprayed.

It may also suffer from other problems, but explosion hazard is a good enough reason not to spray it.

Quote:

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Originally Posted by ian

7008's technical data sheet, suggests 10% as the upper limit for thinning.

also, how cold is it where you are working? Could low temperature be an issue.

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I doubt it. I have applied in a broad range of temp. I get the same results even at 12 degrees C as I do near 30C.

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Originally Posted by SPF

Many 2pac products need to be sprayed with a grounded gun, and need to have adequate fan forced ventilation - given the purpose of 7008 (floors and timber more generally) it makes more sense to say that it shouldn't be sprayed.

It may also suffer from other problems, but explosion hazard is a good enough reason not to spray it.

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As I understand there isn't much difference between 7008 to 2pack polyu in the auto trade. I bet it could be thinned down & sprayed no problems with a good setup. If there is explosive risk with spraying, it would be the same for diy spray painters in their garage id imagine.

What do you guys use for filling deep cracks when you wan't it see thru? I tried to use some 2pack clear, but I get occasional air bubbles stuck in the voids & it takes many coats to fill the cracks as it tends to rise up out of the cracks onto the wood surface.

I'm reading about sellys araldite epoxy glue. Might try that & hope its as transparent as my clear method.