Sunday, September 23, 2012

Drying time, Humidity and the Oven

Drying Fast and slow.


When applying finishes, you want a clean, smooth wood surface in order to get a glass like finish on the item ou are making.

Most finishes are evaporative - which means that they need to dry by something in them evaporating into the atmosphere.  Like wall paint.  Put it on wet, then water evaporates and it is then dry.

So there are factors that either slow or speed this process.  One of the is humidity if there more water in the air, the slower that the finish will dry. 

It's humid in the summer.  It's humid when it rains.  Cool and rainy is possibly the longest wait for the finish to dry. 

Waiting is not my personal forte.  AND, in waiting your finish is wet a lot longer.  Like when the furnace kicks on for the first time in the Fall and throws dust around.  Dust LOVES finishes.  It Looks for them.  Dust will get in your finish.  Cat hair, dog hair, feathers, and dust will get in your finish. 

So, in order to get the finish to evaporate you can put pieces in the oven.  And turn on the light.  The humidity is very low.  The light bulb raises the temp to about 90F.  Perfect.  No dust, warm and dry.  Perfect to let a piece set overnight.  I walk away. 

Now, once in an apartment I started the oven and successfully burned up the directions.  I look in the oven now before turning it on. EVERY time.   Always.

Until the afternoon Eric decided to pre-heat the oven.  And didn't look.  Shellac burned up pretty quickly.  The finishes had to be dragged off and redone from the beginning.  Finishing takes 4 days to accomplish on one piece.  4 days gone.  4 Days.  GONE.

NOW - we have a system.  See below:  Lol.

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