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Shellac as a sanding sealer

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Forum topic by bygrace posted 04-05-2016 01:06 AM 637 views 0 times favorited 10 replies Add to Favorites Watch
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bygrace

164 posts in 1429 days


04-05-2016 01:06 AM

Topic tags/keywords: question mahogany finishing shellac sanding sealer

Just finished putting the last coat of Danish oil on 3 mohagany benches, and was wondering if shellac makes a good sanding sealer. I will be finishing with lacquer. I’ve heard that shellac can be used with just about any finish, but wasn’t sure how effective it was as a sealer. Thanks in advance for your thoughts!

-- Andy, Waxahachie, Tx.


10 replies so far

View conifur's profile

conifur

955 posts in 611 days


#1 posted 04-05-2016 01:14 AM

A 1 1/2 – 2lb cut of non waxed is an excellent sanding sealer, also can be used to tone/alter the color a bit if so desired by witch color flakes you would use if mixing your own, store bought is pretty blond.

-- Knowledge and experience equals Wisdom, Michael Frankowski

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Jim Finn

2408 posts in 2381 days


#2 posted 04-05-2016 01:41 AM

I agree. I have used shellac as a sanding sealer for years.

-- "You may have your PHD but I have my GED and my DD 214"

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jbay

806 posts in 358 days


#3 posted 04-05-2016 01:46 AM

I would just use a lacquer sanding sealer. Why not use a finishing system made to work with each other.
My opinion is sanding sealer has more solids and sands much better between coats.
If your spraying lacquer you should look into pre cat lacquer. It’s a stronger and better feeling finish that takes less coats and looks better, and you can use itself as a sealer without having to buy a second product.

What makes shellac better?

-- My “MO” involves Judging others, playing God, acting as LJs law enforcement, and never admitting any of my ideas could possibly be wrong or anyone else's idea could possibly be correct -- (A1Jim)

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bygrace

164 posts in 1429 days


#4 posted 04-05-2016 02:26 AM

jbay – I have always used aerosol cans of lacquer because it was easier for the small projects like boxes and lamps that I made. Since I am working on some larger projects now, I bought an Earlex spray station. This will be the first project I use it for. I have a can of Deft brushing lacquer I plan on using. Is that the pre cat lacquer you are referring to?

conifer and Jim – thank you for your responses. I’ve always heard you could use shellac with just about anything, but wasn’t quite sure about as a sanding sealer. Thanks!

-- Andy, Waxahachie, Tx.

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conifur

955 posts in 611 days


#5 posted 04-05-2016 02:39 AM



jbay – I have always used aerosol cans of lacquer because it was easier for the small projects like boxes and lamps that I made. Since I am working on some larger projects now, I bought an Earlex spray station. This will be the first project I use it for. I have a can of Deft brushing lacquer I plan on using. Is that the pre cat lacquer you are referring to?

conifer and Jim – thank you for your responses. I ve always heard you could use shellac with just about anything, but wasn t quite sure about as a sanding sealer. Thanks!

- bygrace
I have struggled for years about buying the Earlax spraier, let me know how you like it, I do Craftmans Style and just dont know how I can cover all, hidden end grain, in sides ect without runs.


-- Knowledge and experience equals Wisdom, Michael Frankowski

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jbay

806 posts in 358 days


#6 posted 04-05-2016 03:14 AM


jbay – I have always used aerosol cans of lacquer because it was easier for the small projects like boxes and lamps that I made. Since I am working on some larger projects now, I bought an Earlex spray station. This will be the first project I use it for. I have a can of Deft brushing lacquer I plan on using. Is that the pre cat lacquer you are referring to?

- bygrace

No, not the Deft, although it is a descent lacquer for an aerosol.
You can buy pre catalyzed lacquer in an aerosol spray from Sherwin Williams.

I use the Sherwin Williams brand. (T77F58 Dull Rubbed Effect)
I usually buy 5 gallons at a time and spray from a pressure pot. I never have used an HVLP rig.

ML Campbell makes a good pre cat as well.

-- My “MO” involves Judging others, playing God, acting as LJs law enforcement, and never admitting any of my ideas could possibly be wrong or anyone else's idea could possibly be correct -- (A1Jim)

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bygrace

164 posts in 1429 days


#7 posted 04-05-2016 04:20 PM

Thanks guys, I appreciate all your help!

-- Andy, Waxahachie, Tx.

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SamuraiSaw

513 posts in 1424 days


#8 posted 04-05-2016 05:19 PM

DO NOT use the brushing lacquer to spray. Brushing lacquer has a huge amount of retarder in in, that’s the reason you can brush it. It dries so slow, you’ll probably have a sticky mess around your spray area.

A gallon of precat lacquer around here is less than $40 and has a shelf life of 9 months to a year. Sanding sealer is about the same. Some guys just use the lacquer as a sealer as well. Since you’ve used a Danish oil, that might be an option. Test a sample first to see if you can get the kind of build you’re looking for. Look at either Sherwin Williams or Kelly Moore for Gemini precat lacquer. Good quality and good value. I like it far better than anything Sherwin Williams sells.

-- Artisan Woodworks of Texas.... www.awwtx.com

View pintodeluxe's profile

pintodeluxe

4852 posts in 2273 days


#9 posted 04-05-2016 06:06 PM

Listen, shellac has its place. If you are refinishing an old desk with wax or contaminants, absolutely seal that with shellac before topcoating with lacquer.

However I have had issues with lacquer over shellac, despite the claim that shellac is a “universal sealer.” If the finish is exposed to direct sunlight within the first 4-5 hours of spraying, it can crinkle. I have had it happen.

With lacquer I have never had that problem. Pre-cat lacquer is its own sanding sealer. It sands as easily as sanding sealer, and with less white powdery dust. Plus you only have one product to buy.
I have used Rudd Duracat, Magnalac, and Valspar brands of pre-cat lacquer all with similar and favorable results. I have used hand rubbed, satin, and semi-gloss sheens and I like the satin best.

Good luck with it.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

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bygrace

164 posts in 1429 days


#10 posted 04-05-2016 08:34 PM

SamuraiSaw and Willie, thanks for the information. I might have tried to spray that brushing lacquer. And I think you’re right Willie, I’m just gonna use the lacquer as the sealer also.

-- Andy, Waxahachie, Tx.

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