The school I'm at was given an upright piano by another school, but the head of music viewed it with disgust as it was so soft and mushy. It's just a forty year old Welmar, like all the other school pianos. No doubt a new set of hammers would work wonders, but that's not an option.
Today I filed and ironed the hammers, and also adjusted the negative lost motion. These steps have made a considerable improvement, and no doubt tuning will also help the perception of the voicing.
As it is, the piano would be quite a nice accompaniment piano, But for what the head of music wants to hear, it still needs a little extra brightness, a little more hardness.
What might you recommend to achieve this? Hairpray?
If you can still get it, you can use model dope its very good and it get you high as a kite.
However,you don't put it on the nose of the hammer and you need to do both sides from 5 passed the hour to 20 passed
Web Master UK Piano Page
Any fool can make a piano-- it needs a tuner to put the music in it