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Author Topic: Help - Sanding Sealer Problem?  (Read 3472 times)

GAS

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Help - Sanding Sealer Problem?
« on: August 21, 2011, 06:48:22 pm »

Today I applied a thin coat of sanding sealer to the outside of my 1.5mm ply and left to dry for a couple of hours. Gave a light sand and came up super smooth. Applied another coat and left for another couple of hours. Now when I try to sand it clogs the sand paper up almost instantly and leaves marks on the finish.

Can someone help?
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craftysod

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Re: Help - Sanding Sealer Problem?
« Reply #1 on: August 21, 2011, 06:55:16 pm »

The reason for this,is the first coat soaked into the wood,providing a sealing coat.
The second coat sat on top of the first,but has not hardened enough to be sanded.
It is advisable to leave 24hrs before sanding any paint/sealer
Mark
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Timo2

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Re: Help - Sanding Sealer Problem?
« Reply #2 on: August 21, 2011, 07:03:56 pm »

Hi Gas

   What type Sand and Sealer

   Timo2
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GAS

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Re: Help - Sanding Sealer Problem?
« Reply #3 on: August 21, 2011, 07:25:14 pm »

Was some good quality stuff that I had lying around. Did a test piece first and all seemed fine even with a second and third coat.

I'll leave it for 24 hours or so and report back.....fingers crossed!
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MikeA

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Re: Help - Sanding Sealer Problem?
« Reply #4 on: August 21, 2011, 07:42:07 pm »

mustve laid the sanding sealer on thick. in a day a managed to sand dry and apply 3 coats. maybe i did wrong. didnt clog though.
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GAS

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Re: Help - Sanding Sealer Problem?
« Reply #5 on: August 21, 2011, 08:29:23 pm »

Just been into the workshop for another look and it seems it's becoming less cloggy with time so i'll leave for a couple of days and then attack it again!
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Timo2

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Re: Help - Sanding Sealer Problem?
« Reply #6 on: August 21, 2011, 09:38:27 pm »

Hi

  Sanding sealer Type      Meth ( Alcohol ) base  or  Cellulose base  ???

    Timo2


    Meth/Shellac  or Plastic  ok2
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GAS

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Re: Help - Sanding Sealer Problem?
« Reply #7 on: August 22, 2011, 06:02:48 am »

Shellac
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Colin Bishop

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Re: Help - Sanding Sealer Problem?
« Reply #8 on: August 22, 2011, 08:39:33 am »

I think shellac is alcohol based. Good stuff. All I can think of is that the solvent in the second layer has temporarily softened the first one and hopefully it will all fuse together and dry out properly. Running a hairdryer over it on moderate heat might help. Once hard, shellac takes a beautiful finish for painting. It is what I normally use to seal the gumstrip covering on my boats although I have been experimenting with the water based one part resins recently.

Colin
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Timo2

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Re: Help - Sanding Sealer Problem?
« Reply #9 on: August 22, 2011, 10:21:53 am »

Hi

   Sand & sealer    Shellac is Alcohol base ( Industrial Meths + Shellac + Talc )  should touch dry in 5mins. sand back in 15mins.

    you also get a Sealer/Finish as  S&S base plus add hard Wax . for a quick finish in wood turning and cabinet work, can become very sticky if you try to rework it.


Timo2
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GAS

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Re: Help - Sanding Sealer Problem?
« Reply #10 on: August 22, 2011, 06:19:33 pm »

Well, panic over!!!

It seems my impatience with the sanding got the better of me and having left it for a good 24 hours and sanding lightly first in a circular motion it's come up like glass  :-))
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Colin Bishop

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Re: Help - Sanding Sealer Problem?
« Reply #11 on: August 22, 2011, 06:30:58 pm »

Great! Nothing like beetle bits. Natural beats synthetic hands down.

Colin
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GAS

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Re: Help - Sanding Sealer Problem?
« Reply #12 on: August 22, 2011, 06:36:09 pm »

Beetle Bits???
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Timo2

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Re: Help - Sanding Sealer Problem?
« Reply #13 on: August 22, 2011, 06:42:58 pm »



       French Polish  top finish    O0   :-))

  timo2 
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Colin Bishop

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Re: Help - Sanding Sealer Problem?
« Reply #14 on: August 22, 2011, 07:01:08 pm »

Quote
Beetle Bits???

Shellac is chitin, or beetle wing cases.

Colin
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Craig Dickson

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Re: Help - Sanding Sealer Problem?
« Reply #15 on: August 22, 2011, 08:44:28 pm »

Today I applied a thin coat of sanding sealer to the outside of my 1.5mm ply and left to dry for a couple of hours. Gave a light sand and came up super smooth. Applied another coat and left for another couple of hours. Now when I try to sand it clogs the sand paper up almost instantly and leaves marks on the finish.

Can someone help?

Hi Gas

I read your original posting with much interest. I would like to offer a different angle on your topic:

I say that because I don’t see any mention of the actual abrasive used in the “sanding process” and yet it makes such a BIG difference.
I accept that it really does pay to allow the opted sealer to harden sufficiently prior to cutting back as previously mentioned.

However, if you are using cheap abrasive papers dry with no lubricant, they will I suggest likely clog quickly and those deposits risk spoiling the finish as they form hard spots on the “sand paper” and dig in.
In my experience of working wood to a perfect finish, the good old fashioned steel wool still has a lot to offer when used dry on well hardened finishes (especially shellac). Not so good though if the finish is still relatively soft or if there are sharp corners in which the steel residue can collect and stick.
One of the best modern abrasives I have used recently is the synthetic Abranet product. It cuts like a dream used dry, does not clog and lasts for an amazing amount of time. My Abranet is in grades from 240 grit to 600 grit which covers most of my wood work prior to really fine finishing.
Okay enough from me on this slightly different angle.
Cheers
Craig
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