WP-34S keyboard overlays wearing out?

[jebem]

Thank You all for your input, Steve, Walter, Barry, Tugdual, Colinh, and Han!

Tugdual, sorry to know about these problems You are experiencing with the overlays. Maybe it is time for you to get another set of new overlays?

Basically what I've learn from your answers is that one needs to be very careful when preparing the calculator to receive the sticker overlays, to maximize its useful life. I have ordered a double set of overlays, just in case.

I have just received my HP-30B this evening at home. The order was set to http://stores.ebay.co.uk/TheKingOfCalculator .
The delivery was really fast - just 4 days from Italy to Portugal, using low cost non registered regular mail!

I plan to post here the progress of this build, but I guess that it will take a few weeks before I get the materials to make the USB to Serial cable that I've ordered from China suppliers.