anyone know if it is possible to thicken a white semi gloss?

What do you mean by " thicking " ?

Is it for acrylic or enamel paints and what is it for ? If the paint has been thinned already not much you can do to it to get it thick ..................

Maybe some here knows

Leave the container open for a while?

two parts semi gloss to one part cornflour. Make sure you don't get it lumpy.

Better explain what you mean before this becomes a pile on

using testors acryl semi gloss to paint the wheel bays on my f-18 but it takes coat after coat and still not that good of coverage.

First, did you wash the parts before you painted them?

Next, do you let the paint cure before you try the next coat? I had the same problem that you are having, so I let the paint dry (cure) longer, and everything worked out. Once, I tried to paint over a 'not cleaned' surface, and the paint had difficulty sticking, particularly with the second coat. i found, also, that this problem occurred only when I was brushing the paint.

Also, have you tried priming the surface before you paint? That helps also. I use a gray or white primer before I do the final color. Also, you can use it to check out your surface for further sanding, filling, etc before you paint. There are a lot of folks here with much more experience (recent) than myself. They'll put some further advice up here as well...in no time the prob will be solved.

Hope this helps a bit.

Matt

White is the hardest colour to apply and you will need many coats . Since you are using gloss this will take some time . Each coat has to fully dry frist before the next one and so and so on . You will find that brush painting white in a flat base will take less coats then the gloss will .

Also since you are using acrylics add a few drops of dish soap to the paint . This will aid in it laying down smoother .

Never had any luck brush painting white of any kind. Best advice I can give is when possible use either an airbrush or Rattlecan. You can turn any white semigloss with a clearcoat of varnish.

Also prime the part first and give the paint something to bite onto besides just the bare plastic.

HTH

Paul

thanks all big help

White is indeed notoriously difficult to apply.

For me, a good second is yellow, it ususally ends up with a greenish tone.

However, I learnded that airbrushing these colors is much easier than applying them with a common brush