"Dave Liquorice" wrote in message
ll.net...
On Fri, 28 Nov 2008 08:05:10 -0000, dennis@home wrote:

He could try a proper experiment..
take a box well insulated on all but one face.
Put in a 40w lamp.
put a sheet of metal on the remaining face
measure the temp in the box after it has stabilised.
See if there is any change in the temperature differences in each
case.

But the paint by it self will make a difference so you need another
metal sheet painted but with out the magic additive.

Only if you are comparing one paint to another.

No you are comparing unpainted with painted + magic additive. How do you
*know* that any difference is down to the paint, the magic additive or a
combination of both? We are trying to find out if the magic additive has
any effect not that painting (with or without magic additive) does.

That is illogical as the additive doesn't work without paint, you can't
compare the additive on its own.


If the first sheet was painted sans additive and the other was painted
with additive that would be OK but I got the impression the first sheet
was unpainted.

It will tell you how well the paint with the additive performs.