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What type of finish can I use on top of Amber Shellac? The can says not to use polyurethane

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Forum topic by ohtimberwolf posted 02-09-2019 09:42 PM 1661 views 0 times favorited 12 replies Add to Favorites Watch
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ohtimberwolf

936 posts in 2862 days


02-09-2019 09:42 PM

Topic tags/keywords: shellac polyurethane steps

What type of finish can I use on top of Amber Shellac? The can says not to use polyurethane on shellac, I tried a sample and it did not dry it just got stiicky.

Amber is the exact color match that I need but I also need to coat my wood steps with something other than shellac don’t I? Would clear shellac be ok for a final finish? larry

-- Just a barn cat, now gone to cat heaven.


12 replies so far

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dhazelton

2839 posts in 2807 days


#1 posted 02-09-2019 09:48 PM

Shellac is not an exterior finish. I think your best bet is to sand it off and use a spar varnish or exterior stain.

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ohtimberwolf

936 posts in 2862 days


#2 posted 02-09-2019 09:51 PM

dhaze, this is for interior steps from the lower level to the top. This is new pine wood steps. larry

-- Just a barn cat, now gone to cat heaven.

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dhazelton

2839 posts in 2807 days


#3 posted 02-09-2019 09:59 PM

If it was waxed shellac I don’t know if anything would dry on it without taking a very long time. You could always build up with more shellac but it doesn’t really build a thick enough film to offer must abrasion resistance. Just walking on it probably will wear through it quickly. Maybe someone else has a thought.

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ohtimberwolf

936 posts in 2862 days


#4 posted 02-09-2019 11:11 PM

dhaze, I got out my large magifying glass and attempted tor read the print on the 1 qt can again. It is not to be used with polyurethane. Case closed.

Now I have to try to find a stain or stain finish exaclty like the color of the amber shellac. I really don’t like trying to match old finsh no matter how nice the house is. Thanks, larry

-- Just a barn cat, now gone to cat heaven.

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AZWoody

1461 posts in 1734 days


#5 posted 02-09-2019 11:23 PM

I believe you can use a alkyd varnish can go over a waxed shellac. I’ve used it with no problems.

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ohtimberwolf

936 posts in 2862 days


#6 posted 02-10-2019 12:13 AM

Thanks Woody, I will try that out. there will be a covering where you walk up the steps, only an area on each side will be exposed. larry

I don’t know what a waxed shellac is. What I have is from Lowes, it is Zinner Bulls Eye Amber.

-- Just a barn cat, now gone to cat heaven.

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ohtimberwolf

936 posts in 2862 days


#7 posted 02-10-2019 01:10 AM

Thanks guys, I did find this info since I decided to look a little further into it. larry

http://forums.finewoodworking.com/fine-woodworking-knots/finishing/minwax-poly-over-shellac-yikes

-- Just a barn cat, now gone to cat heaven.

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Fred Hargis

5753 posts in 3003 days


#8 posted 02-10-2019 12:23 PM

Urethane finishes are not always a problem with waxy shellac, but often enough there’s little reason to take a chance. the problem is that urethane inhibits adhesion, and the wax compounds the problem. As mentioned above, an alkyd (or phenolic, which is very dark) resin varnish would not have these problems. But it might be very hard to find, the only 2 I’m aware of if the Pratt and Lambert 38 and the (now defunct, apparently) SW Fast Dry Oil Varnish. The SW may have been relabeled as a Min Wax product (Min Wax Fast Dry Oil Varnish). You can check at the SW store, if it has urethane in it it willcertainly be called out on the label.

-- Our village hasn't lost it's idiot, he was elected to congress.

View ibewjon's profile

ibewjon

997 posts in 3303 days


#9 posted 02-10-2019 02:24 PM

Regular shellacs contain wax. There is de-waxed shellac that says it can be used as an intermediate coat between shellac and poly. When I have time, I plan to use it on waxed hardwood floors so I can put on a poly finish. Zinser makes the de-waxed, mine came from Menards. If shellac doesn’t dry properly, it is probably outdated. Check the date on the can.

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Jim Sellers

464 posts in 2845 days


#10 posted 02-10-2019 02:25 PM

I would put a couple of coats of dewaxed shellac (zinser seal coat) over the waxed finish then you should be able to use the poly over that.

-- J.C.Sellers, Norcross, Ga. Just cut it right the first time. The best carpenters make the fewest chips.

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bondogaposis

5542 posts in 2861 days


#11 posted 02-10-2019 03:29 PM



I would put a couple of coats of dewaxed shellac (zinser seal coat) over the waxed finish then you should be able to use the poly over that.

- Jim Sellers

Bingo!

-- Bondo Gaposis

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ohtimberwolf

936 posts in 2862 days


#12 posted 02-10-2019 05:15 PM

Thanks guys, I’m on the project now so I want to thank each one for what I have learned from this. larry

-- Just a barn cat, now gone to cat heaven.

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