Paradox of the trumpet shape This is a question I had for long time now, when you rotate the function $y=1/x$, $x>0$ (say $x$ and $y$ both measure meters) about the $x$ axes by $2\pi$ you get a shape which has infinite surface area and finite volume.Lets call this shape "trumpet shape". Now the weird thing is that suppose I have a  "trumpet" shape that is made of by arbitrarily small transparent  material (imagine folding a transparent sheet to this trumpet shape). Since it's volume is finite I can fill the whole trumpet with finite amount of paint say $k$ litres.But since the surface area is infinite, no matter how many paint I have I can still not paint it's surface area. Now suppose I pour $k$ litres of paint in my "trumpet shape", then the whole trumpet is filled with paint.Now imagine how this trumpet made of transparent material looks like.It looks like it's surface area is painted and since our transparent material is arbitrarily small we can effectively say that the surface area is painted using $k$ litres of paint. A contradiction
What am I saying wrong here?
Thank you

Your issue is trying to compare a 2 dimensional object (surface area) with a 3 dimensional object (volume).  Any volume of liquid can be spread thin enough to cover as much surface area as you want (mathematically speaking, there are probably physical limits to this).  
