Is primer necessary?

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Is primer necessary?

Postby Mike Kinny » Tue May 28, 2019 9:43 am

Hi,

What is a primer and why is it necessary to apply before lacquer? This is to finish a classical guitar.

Thanks
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Re: Is primer necessary?

Postby Barry Daniels » Tue May 28, 2019 10:07 am

No.
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Re: Is primer necessary?

Postby David King » Tue May 28, 2019 6:04 pm

Unless you need a filler coat, i.e. not a primer but something to fill the open pored grain in certain woods like mahogany, walnut, East Indian Rosewood and many others.
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Re: Is primer necessary?

Postby Clay Schaeffer » Wed May 29, 2019 8:28 am

Primer/sealers reduce the number of top coats that need to be applied to obtain a smooth finish. You can "self seal", which is to say spray additional coats of top coat until it fills the pores of the wood.
Some guitar builders use epoxy resins to fill the pores of the wood and top coat over that.
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Re: Is primer necessary?

Postby Rodger Knox » Wed May 29, 2019 2:58 pm

A primer is a base coat usually employed to improve adhesion between the surface and the top coat. A sealer is similar, but it's purpose is to seal the surface. A pore fill is a little different, it's purpose is to seal the pores in wood that has pores. Primers are not generally used on wood, while pore fill and a seal coat are common under lacquer. Classical guitars traditionally have a French polish finish, which is a hand applied spirit varnish.
A man hears what he wants to hear, and disreguards the rest. Paul Simon
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