Jonathan
Oud Junkie
Posts: 1582
Registered: 7-27-2004
Location: Los Angeles
Member Is Offline
Mood: No Mood
|
|
Polyurethane over shellac?
Does anybody out there know if I can use polyurethane over shellac?
I am finishing up oud #5, and have a few coats of shellac on it. It looks fine, but I would really like to put some polyurethane over it for
durability. Any thoughts?
Thanks!
|
|
|
spyrosc
Oud Junkie
Posts: 405
Registered: 9-18-2003
Location: Northern California, USA
Member Is Offline
Mood: Grateful
|
|
Yes, it's doable.
Spyros C.
|
|
|
Yaron Naor
Oud Junkie
Posts: 275
Registered: 1-24-2009
Location: Bat Hefer, Israel
Member Is Offline
Mood: Happy
|
|
Yes, but be carfull
You can do it... but note that any oil or fingerprints on the shellac will cause you trouble, (orange skin)
Ether you clean it very good with baby wipeons
Or you can clean the Shellac with alcohol and than apply the finish
In both option, spray a fast and thin first coat and than proceed
See the attached image of semi mat polyurethane finish over shellac
Good luck!
Yaron
|
|
|
Abo Zaina
Oud Lover
Posts: 13
Registered: 8-3-2010
Location: UAE
Member Is Offline
|
|
I was thinking of such idea but only for the bowel to protect it from my excessive sweating  ( it reaches 50 during summer where I live)
theoritcally I don't think this will affect the sound but I was hesitant because of I'm not sure if it is possible.
and I have the glossy wipe-on poly I'm not sure about the quality of the finish since it is mostly applied by spraying poly.
I'll try it on a piece of wood then if im happy with the results I'll go for it
|
|
|
fernandraynaud
Oud Junkie
Posts: 1865
Registered: 7-25-2009
Location: San Francisco, California
Member Is Offline
Mood: m'Oudy
|
|
Since it goes on top of an existing finish you'll also have to try it in a least obvious corner of the bowl. Some varnishes are more compatible than
others and you can end up with all sorts of swampy messes. You also need to thoroughly clean the surface first, and that needs testing too, as alcohol
dissolves some finishes, acetone dissolves others.
|
|
|
Jonathan
Oud Junkie
Posts: 1582
Registered: 7-27-2004
Location: Los Angeles
Member Is Offline
Mood: No Mood
|
|
Thanks a lot guys!
5 coats of shellac, and so far a couple of coats of polyurethane. It's looking sharp. I'll post some pics when I'm done.
As always, I real appreciate the help
|
|
|
FastForward
Oud Junkie
Posts: 225
Registered: 6-2-2008
Member Is Offline
Mood: No Mood
|
|
Hi Jonathan, I was reading about this the past couple of days and it seems that generally there shouldn't be a problem as long as you made sure to use
dewaxed shellac and that you cleaned any possible oily residue.
Looking forward to seeing the finished oud.
|
|
|
SamirCanada
Moderator
Posts: 3405
Registered: 6-4-2004
Member Is Offline
|
|
Good stuff Jonathan.
looking forward to see the pics too! your latest instrument was stunning my friend.
did you notice any difference between the drying times of the poly when applied over shellac?
If it doesn't thoroughly dry you might have problems with the wax in the shellac preventing the adhesion of the polyurethane.
let us know.
@samiroud Instagram
samiroudmaker@gmail.com
|
|
|
Jonathan
Oud Junkie
Posts: 1582
Registered: 7-27-2004
Location: Los Angeles
Member Is Offline
Mood: No Mood
|
|
Thanks Samir
No problems thus far, but it was a couple of days after the last coat of shellac become I put on the first coat of poly.
I haven't really used poly much in the paast. I did restore an oud, and did use poly alone (no shellac) with decent results, but I really love the
look of shellac--that little bit of amber just gives the wood such warmth.
|
|
|
![[*]](images/xmbprobrown/default_icon.gif){kind=icon}
