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#629345 - 03/05/04 01:43 PM WD-40 or Selleys RP7
nextturnpls Offline
Full Member

Registered: 09/20/01
Posts: 35
To all piano technicians,

As the humidity is as high as 80% to 90% daily in tropical country may I know how to prevent the upper register piano steel strings from getting rusty besides installing damp-chaser and cover the piano with a thick cotton cover?

Can I spray certain amount of WD-40 OR SELLEYS RP7 on a piece clean and dry cotton cloth and apply them throughly on all the steel strings surface to prevent rust?


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#629346 - 03/05/04 02:10 PM Re: WD-40 or Selleys RP7
BDB Online   content
Yikes! 10000 Post Club Member

Registered: 06/07/03
Posts: 23192
Loc: Oakland
You can try it. Keep it away from the damper felt. But when all is said and done, a piano is not really meant for that type of climate, even if everything in it is tropicized. You just have to expect that things won't last as long as they would under better conditions.
Semipro Tech

#629347 - 03/05/04 09:15 PM Re: WD-40 or Selleys RP7
Rick Clark Offline
1000 Post Club Member

Registered: 01/04/03
Posts: 1810
Loc: North County San Diego CA
I don't know what Selley's is, but lubes like WD-40 or anything with silicones are considered a high risk to apply due to the tendancy for it to travel over time. The lube can get into all kinds of places it doesn't belong. The only case I have ever heard of a PTG tuner actually being expelled from the org for incompetence had to do with his use of lubes in pianos and refusal to mend his ways. I have seen the ruinous remains of pianos he has "treated".

If it's a grand, a 100% wool string cover (not cotton!) with a 15 or 25 watt dampp-chaser rod under that cover should be the most effective thing against string rust. I don't know why you are against it, but that's what I would recommend.

If it's an upright, a 50 watt rod and humidistat will do the job.


Rick Clark
Rick Clark

Piano tuner-technician

#629348 - 03/06/04 10:25 AM Re: WD-40 or Selleys RP7
JIMBOB Offline
1000 Post Club Member

Registered: 11/18/02
Posts: 1338
Loc: South Carolina
I agree with Rick. WD 40 or any lube/protectant should not be used any where IN the piano. The use of a string cover, dampp chaser and undercover should help with the wire rust. You may also want to try some of the new moisture
sorb socks on top of the plate. Some one also makes piano wire for high humidity locations. Keeping you fingers and hands off of the wire when re-stringing will also help.
Certificate in Piano Technology NBSSP
Associate Member PTG
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#629349 - 03/06/04 09:24 PM Re: WD-40 or Selleys RP7
BDB Online   content
Yikes! 10000 Post Club Member

Registered: 06/07/03
Posts: 23192
Loc: Oakland
Looking over my answer, I have to expain further. You should never put anything on the wound strings. Lubricants will loosen the bond between the winding and the core, and ruin the string in no time. By no means should you just start spraying things indiscriminately. I have used WD-40 on plain wire strings, applied sparingly with a rag, before the wound strings were installed. It should clean off anything that may have gotten on the strings while they were being installed, despite my restringing gloves. But I am extremely careful with it, keeping it away from the tuning pins and any areas where it might cause problems.
Semipro Tech


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