Suggestions for Speaker Varnish / Coatings - diyAudio
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Old 1st June 2004, 06:42 AM   #1
jkesa is offline jkesa  United States
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Default Suggestions for Speaker Varnish / Coatings

I have a couple of 20 year old speakers that look and sound good. However, the 10 inch paper cone and cloth-line rim look dried out. Any suggestions to restore and preserve ? Thanks.
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Old 1st June 2004, 11:10 AM   #2
sreten is offline sreten  United Kingdom
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PVA wood glue can be used as a sealer.

Dilute 50% and apply in thin coats with a brush,
say two coats, but one may be enough.

You don't want to apply too much and unduly stiffen up the surround.

They will come out looking nearly new.

sreten.
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Old 1st June 2004, 07:35 PM   #3
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You can even add food coloring. I didn't like the yellowy color, so I combined blue and red food coloring to thin the glue. The result is a very dark blue/purple which dries almost black on a black paper cone.
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Old 1st June 2004, 08:07 PM   #4
sreten is offline sreten  United Kingdom
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whist JC may be correct, IMO you simply don't need it, sreten.
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Old 2nd June 2004, 06:42 AM   #5
jkesa is offline jkesa  United States
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Thanks for the info. However, what does the PVA stand for ? Any brand I would be familiar with in the states ?
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Old 2nd June 2004, 10:27 AM   #6
sreten is offline sreten  United Kingdom
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PVA = poly vinyl acetate.

Basically a white (dries slightly opaque clear) water based wood glue.

There are many brands, Unibond is popular in the UK.

Titebond or Elmer's ?

sreten.
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Old 2nd June 2004, 11:04 AM   #7
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sreten,

How about shellac?

Cheers,
Bas
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Old 2nd June 2004, 11:26 AM   #8
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by Bas Horneman
sreten,

How about shellac?

Cheers,
Bas
no experience,

http://www.shellac.net/faq.html

but does not appear to be suitable.

http://www.t-linespeakers.org/design/tweeks.html

Is another option.

sreten.
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Old 2nd June 2004, 12:36 PM   #9
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Default Its just an idea

I used to water proof speakers for friends in the Rainy back woods in Loch Lomond, I used a high Gloss laquer, modern Spray cans have very tuff formulas and are very light and apply well on almost anything apart from greeze!! This would protect your drivers and even add a bit of stiffness! i would recommend a arcylic as the flex well around the surround, apply a small amount to test it first as it will never come off so choose wisely. But it will work, PVA is very heavy in comparision even if watered down 50%,, just an idea.
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Old 2nd June 2004, 01:31 PM   #10
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I've heard that dammar varnish, available at art supply stores, is better than typical shellac.
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