[pianotech] More agraffes...kind'a

[Encore Pianos]

Hi Jim:

 

I've used the SEM High Build Primer, and think it is fantastic stuff -
builds nice and sands incredibly easily.  I found that using scotch Brite
pads - the coarser Red and the finer Grey were the way to go, because they
will far more readily conform to the curved surfaces of a piano plate, yet
level the primer very easily.  But I used it based on the recommendation of
my auto paint guy, and he assured me that the auto paint urethanes that I
followed it with would be compatible.  It was.  

 

As for excessive build up around your agraffes, that has not been a problem
for me using this primer.  Don't try to do too much in one coat, and follow
the spray schedule recommended for these catalyzed auto paints. 

 

Will

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Jim Ialeggio
Sent: Tuesday, August 21, 2012 9:19 AM
To: pianotech at ptg.org
Subject: [pianotech] More agraffes...kind'a

 

Al said:

<Since the nitro can't re-solvate a catalyzed primer, you need a good
mechanical bond. It's hard to get a good sanding in the recesses. 

right, so those limitations, regrading bonding, define the task as a failure
from the start, if you can't adequately prep the recesses which make up a
large portion of the acreage. Seems to makes more sense to shoot for a
chemical bond from the start.

Though I will say the SEM high build primer I was using was not catalyzed,
and could be solvent melted. So I'm not sure it was a bonding, rather than a
compatibility issue.   

Jim Ialeggio



-- 
Jim Ialeggio   
jim at grandpianosolutions.com
978 425-9026
Shirley Center, MA
 
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