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UV light and varnish drying

 
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actonern
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Joined: 15 Aug 2007
Posts: 444
PostPosted: Mon Apr 14, 2008 6:36 am    Post subject: UV light and varnish drying Reply with quote
Many oil varnishes will remain sticky for days or weeks if kept in the dark after being applied.

Yet a few hours in the sun or artificial UV exposure and they're dry to the touch in mere hours. Does anyone know what it is about UV light that speeds up drying?
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mapleleaf_gal
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Joined: 24 Mar 2007
Posts: 73
Location: tucson, az
PostPosted: Mon Apr 14, 2008 5:25 pm    Post subject: Reply with quote
probably because it is an oxidation process instead of an evaporation process.
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M_A_T_T
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Joined: 03 Apr 2007
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PostPosted: Tue Apr 15, 2008 12:35 am    Post subject: Reply with quote
mapleleaf_gal wrote:
probably because it is an oxidation process instead of an evaporation process.


Yes, doesn't the oil harden as it oxidizes? Spirit varnish, for example, dries by the evaporation of the solvent.
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mapleleaf_gal
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Joined: 24 Mar 2007
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Location: tucson, az
PostPosted: Tue Apr 15, 2008 11:49 pm    Post subject: Reply with quote
M_A_T_T wrote:
mapleleaf_gal wrote:
probably because it is an oxidation process instead of an evaporation process.


Yes, doesn't the oil harden as it oxidizes? Spirit varnish, for example, dries by the evaporation of the solvent.


it seems logical to me. i dont know why or how. maybe i'll learn that when i take more chemistry.
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Janito
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Joined: 08 Oct 2007
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PostPosted: Wed Apr 16, 2008 10:04 pm    Post subject: Reply with quote
UV light crosslinks proteins and carbon-based polymers - that's curing of a varnish.
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