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Question about using two different brands of poly

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Forum topic by Chuck1685 posted 03-04-2016 01:05 PM 386 views 0 times favorited 6 replies Add to Favorites Watch
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Chuck1685

17 posts in 554 days


03-04-2016 01:05 PM

Hello all. I need some desperate help asap. I recently finished a kitchen table for a commission job. It is set to go out tomorrow and for the life of me I can’t get rid of the brush marks on the top from the polyurethane. Normally I use gen finishes oil and water based poly for my finishes. However, I was all out this time and my Amazon order for the new batch was delayed a week! So I made the mistake of getting Varathane brand polyurethane from one of the big box stores. It’s a water based which is fine but after every coat I am left with brush marks. I have tried everything to eliminate them… Thinned 25-50%, switched applicators from synthetic brush to pad to tshirt to foam brush, etc. I have sanded between each coat with 400 grit and have 4 coats down already. Well the gen finishes water based poly just showed up… So my question is can I sand the 4th coat down a bit and apply the gen finished over the varathane with good adhesion? Thanks in advanced to anyone who can help with this.


6 replies so far

View HokieKen's profile

HokieKen

1807 posts in 605 days


#1 posted 03-04-2016 04:03 PM

Never used general finishes poly but, I put down my film building coats with a brush. After the last coat, I sand smooth with 600 SiC sandpaper then rag a final coat on that’s cut 50/50 with MS. After that cures, if necessary, I rub it out with #0000 steel wool to get the finish/sheen I want.

Don’t know if that helps but it’s all I have to offer! Best of luck.

-- Kenny, SW VA, Go Hokies!!!

View conifur's profile

conifur

955 posts in 618 days


#2 posted 03-04-2016 04:13 PM

Yes you can.

-- Knowledge and experience equals Wisdom, Michael Frankowski

View BurlyBob's profile

BurlyBob

3695 posts in 1732 days


#3 posted 03-04-2016 04:37 PM

What Kenny said! I’ll use a polyester cloth folded maybe 3”- 4” and used the fold like a squeegee. I thin my poly way down, almost to water, letting it dry real hard between cloths.

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Chuck1685

17 posts in 554 days


#4 posted 03-04-2016 04:45 PM

Thanks guys for the help. I ended up sanding that last coat of the Varathane with some 400g. I put down a thin coat of de waxed shellac and let dry for about an hour or so. I sanded lightly with 600g then put on the Gen Finishes. Worked out good! It’s weird I have never had a problem with the cheaper poly’s before. I think the issue with the Varathane is that it dries so fast it has no time to level itslef. Anyhow, thanks again!

View BurlyBob's profile

BurlyBob

3695 posts in 1732 days


#5 posted 03-04-2016 04:48 PM

That looks real nice.

View Chuck1685's profile

Chuck1685

17 posts in 554 days


#6 posted 03-04-2016 06:21 PM

Thanks BurlyBob

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