to paint or not

Unless you can make the seam down the top go away with careful gluing, sanding and polishing; paint it. Some amount of the above will be required anyways, but polishing the plastic will take work.

Bill

Styrene does not have a highly reflective surface- much of the reflected light you see is from below the surface, and is scattered light.  While you can improve the surface reflectivity with a coat of gloss clearcoat, white paint looks better yet.  The scattered light from below the surface also tends to diffuse surface detail.

I Say-Oldboy!

      If it was me I would build it the way I want to. Now that said, Some plastic, especially White and Grey from Airfix, do some strange color changes over the years. I have two untouched Early German "S" boats and a relatively new one.

     The two older ones are different shades of Mustardy Grey. The newer one is as molded in their nice light grey. Neither of the original spent time in storage or attics, Just in closet stashes.

 I do apologise. I forgot to mention something. I have REVELL'S U.S.C.G. High Endurance Cutter(Old Description) Roger B. Taney. It came molded in a nice rich Milk color. Now, it has, in the box ! turned the color of Old Butter!

Definitely paint it. Flat white primer, then gloss white.
I would use Tamiya spray lacquers, decanted and thinned (use their lacquer thinner X-20A) and sprayed with an airbrush.
I've had incredible results using that stuff. Dries quickly and polishes beautifully.

Besides......decals don't adhere very well to bare plastic, normally. But don't quote me on that....some people can make magic happen.

In my experience unpainted white may discolor over time.  I would hate for my shiny concorde to turn yellow.

Keavdog

Porsche looks like you spent time painting, sanding and polishing the body.  Didn't think you could get that kind of finish without painting.  

I would say paint it but I think painting is one of the most fun parts about this hobby.

oldboy

i have a revell concorde which comes in white the instructions say paint it white do i really have to paint it as its allready whitea  

I'll say the same thing I said in your original thread about whether to paint or not-build the model and finish it the way you want to do it.

I have the same kit and I definitely will paint.  I have a couple examples of kits I didn't paint - Tamiya molds their bike kits black parts in a perfect satin black.  I also did this Porche just polishing and clear coating.  But as others have said in the other thread - white needs paint.

Yes,you need to paint it

I vote to Paint! You'll get a better sheen. Plus it's fun to paint.