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Problem with blemish—shellac with GF High Performance.

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Forum topic by CharlesA posted 12-27-2017 06:52 PM 2312 views 0 times favorited 14 replies Add to Favorites Watch
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CharlesA

3342 posts in 1973 days


12-27-2017 06:52 PM

This is GF high performance over de-waxed shellac. This blemish has appeared. I thought it looked like something stuck to the finish, but it seems too embedded for that. I’ve been rubbing with steel wool.

I’ve had a lot of luck with this finish. I’m a bit perplexed. Any ideas?

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson


14 replies so far

View pintodeluxe's profile

pintodeluxe

5784 posts in 2989 days


#1 posted 12-27-2017 07:12 PM

Are you willing to thin some of your topcoat and brush or rag on a little more finish?

Maybe add a couple more pictures so we can get a better idea what it is.
On rare occasion, I’ve had a finish turn white in spots, usually in extreme hot or extreme cold conditions. I feel like temperature matters, not just when applying the finish, but also for a period of time while it cures.

In my case, I’ve always been able to correct the problem by applying another coat and re-buffing. I use lacquer though, which melts into the previous finish.

On the next go-around I would wet sand the final coat with a 1200-1500 grit soft sponge and tap water once the finish is fully cured. Once you try wet sanding, you won’t go back to steel wool.

I hope you find success with your project.

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

View a1Jim's profile

a1Jim

117276 posts in 3753 days


#2 posted 12-27-2017 07:34 PM

Isn’t GF High Performance water base? you don’t use steel wool with water base products.

-- https://www.artisticwoodstudio.com/videos wood crafting & woodworking classes

View pontic's profile

pontic

634 posts in 784 days


#3 posted 12-27-2017 07:50 PM

Something hydrophobic got splashed on the wood. Definitely looks like a splash stain. Maybe before you ever got the wood. Did you buy it from a big box store? Mill it your self? was there a UPC sticker there? Somebody drop some wax or WD40 on it when you weren’t around? Don’t know.
Bottom line you have to sand down the finish there and sand down to and thru the stain. then wash it with alcohol. Let it dry then test it. If it still shows thru either repeat or sand off all finish re mill and start over. Remember you have to sand a much wider area than the blemish to get a good blending and to get the appearance of flat surface. My 2 cents; .000376 cents at the lumberjock exchange rate.

-- Illigitimii non carburundum sum

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CharlesA

3342 posts in 1973 days


#4 posted 12-27-2017 08:25 PM



Isn t GF High Performance water base? you don t use steel wool with water base products.

- a1Jim


I have bronze wool for this reason, but I’m in the process of moving, and almost everythingtjingnisnpa Jed. This is something i made a while back, so I picked up some steel wool today to see if it would rub off. Good reminder to clean as well as possible.

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

View pintodeluxe's profile

pintodeluxe

5784 posts in 2989 days


#5 posted 12-27-2017 09:33 PM

Oh, so this was an existing piece in use? Damage from a hot pan?

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

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CharlesA

3342 posts in 1973 days


#6 posted 12-27-2017 09:55 PM

Could be. It’s a desk about a year old. I am going to try a little HP—it supposedly dissolved into prior coats as well.

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

View TheFridge's profile

TheFridge

10506 posts in 1662 days


#7 posted 12-28-2017 03:35 AM

I wouldn’t use hydrogen peroxide. It can chemically react with shellac and create Thermite.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View a1Jim's profile

a1Jim

117276 posts in 3753 days


#8 posted 12-28-2017 03:48 AM

naphtha is a great cleaner and will remove most contaminants and usually, shellac will seal most contaminants off.

-- https://www.artisticwoodstudio.com/videos wood crafting & woodworking classes

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CharlesA

3342 posts in 1973 days


#9 posted 12-28-2017 03:56 AM



I wouldn’t use hydrogen peroxide. It can chemically react with shellac and create Thermite.

- TheFridge


where did hydrogen peroxide come from?

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

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TheFridge

10506 posts in 1662 days


#10 posted 12-28-2017 03:58 AM

HP = hydrogen peroxide. Seriously. It can spontaneously explode.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View CharlesA's profile

CharlesA

3342 posts in 1973 days


#11 posted 12-28-2017 04:00 AM

HP=General Finishes High Performance

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

View TheFridge's profile

TheFridge

10506 posts in 1662 days


#12 posted 12-28-2017 02:18 PM

HP=Hewlett-Packard?

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View jacww's profile

jacww

26 posts in 1183 days


#13 posted 12-28-2017 04:12 PM

The wonder of AA.

AA = Ambiguous Abbreviations

TonyC

View CharlesNeil's profile

CharlesNeil

2454 posts in 4046 days


#14 posted 12-28-2017 04:21 PM

Charles this looks to me like the finish is lifting off, ( peeling) from the shellac … can you feel it, and does it sratch off with your fingernail .. I have seen it happen before

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