Revell putty softener needed.

I use as swanny's or other modelers technique here. If you have future (in Malay I think future sold at Ace hardware), just mix with baby talcum powder. To remove the excess, I usually only swap with tissue/cotton bud (dip into wiper fluid or windex before). Very smooth and don't need sanding at all. I don't know the exact softener for revell putty, is that a lacquer base?

After putty dries you aren't supposed to be able to soften it. If you want to see something hard, try some Milliput sometime. It is epoxy putty and once it dries it is hard as concrete.

Try Matt's method, as beSeen mentioned, at this link:
http://www.swannysmodels.com/Seams.html

Use pieces of masking tape along the edges of the area to be puttied. Once the putty is in place, immediately smooth it down with a Q-Tip moistened with acetone. Let it dry and then sand smooth.

Ok. thanks a lot guys.