In my attempts so far to repaint, what i have done was to go into the paint program, open my C drive folder, find FS9, pick an aircraft, find the fuselage texture and paint over it. It works for my friend but it wont work for me. The only one that has worked so far was a boeing BWB. I painted it all black and it actually came out. As far as all of the others go... they all just come out blank now. Except for my united 757-222. I only painted half, so only half came out blank lol

sounds like you didnt convert it back int,o a format FS will read. (Talking FS9 here, if your on FSX then the specifics will be different)

Heres an extract from a doc I once wrote, about repainting:

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Formats

A normal .bmp which you would find on your computer is a '24bit' bitmap. Flight Sim WILL NOT read a 24bit image,

It will however read the following:

32Bit - uncompressed, full clarity, large file size
8Bit - uncompressed, limited to 256 colours
dxt3 - compressed, looses quality, but smaller file sizes.

There are other formats, but those three are the major ones for use on aircraft.

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also...

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Texture Format Converters

Do exactly what thay say on the tin, convert bmps from 'normal' bmp format (that is, 24 bit), to formats that flightsim will read (principally 32bit and dxt3).

The two major converters are DXTBmp and Imagetool. I use a mixture of the two as they both have advantages and disadvantages.

DxtBmp can handle 'the Alpha layer' used in reflective textures, but imagetool is quicker on my system, and can have multiple images open at once.

DxtBmp:
http://www.mnwright.btinternet.co.uk/programs/dxtbmp.htm
Imagetool
http://www.projectopensky.com/files/index.php?dir=paint-resources/&file=imagetoo...

Imagetool is just a single file, no install needed, so just sit it somewhere useful like in ur FS aircraft directory.

Its worth noting that, as far as I can tell, DXTBmp will be required to open the textures used in FSX, unless a new version of Imagetool is released.

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I actually use both, in conjunction,

I use Imagetool to open my .psd files, and then save them strait to 32bit

Once i'm happy with the file, I'll use dxtbmp to save the file to dxt3 and add any alpha!