[pianotech] How long does a finish need to cure before moving

[Mark Potter]

David -

As usual, Ron has covered all the bases very thoroughly.  There are SO many 
factors that can yield a 'soft belly', but assuming fairly sensible application 
techniques, along with appropriate materials and spray schedules, I have long 
considered the 30 day rule pretty safe.  Absent the previously mentioned 
assumptions, though, all bets are off.  I don't disagree at all with Al's 21 day 
figure, but with lacquer there are enough variables to make blanket estimated 
cure times virtually useless, esp. here in the midwest where I reside.  Arizona, 
for example, would be vastly different than Ohio, I'm sure!  Bottom line, every 
situation is unique, with the finisher being the only one with access to 
legitimate info.  


As in most things, common sense rules the day....  

Mark Potter    




________________________________
From: Ron Nossaman <rnossaman at cox.net>
To: pianotech at ptg.org
Sent: Sat, November 5, 2011 3:38:19 PM
Subject: Re: [pianotech] How long does a finish need to cure before moving

On 11/5/2011 2:18 PM, David Love wrote:
> Sorry, off topic again, technical piano question not to do with signing in
> or paying bills on line.
> 
> How long generally does a lacquer finish need to cure before it's safe to
> lay the piano on its side to move it without it showing a blanket imprint.


I intensely dislike refinishing, but have done enough (too much) for some 
general thoughts.

It depends on the primer, finish, the rate of application, and the climate in 
which it was done and is curing out. Thicker finishes take longer. Too little 
time between coats and too high a build rate takes longer. Soft primer takes 
longer. A good polyester primer, not overly heavily applied and mostly sanded 
away, with thin subsequent topcoats allowing more time between coats than you'd 
like - days (warmer is quicker), produces the most durable finish in the 
shortest time that I've seen. There are vastly more experienced refinishers on 
the list that can hopefully correct me if that's contrary to their experience.
Ron N
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