Question !!!

Decided today to continue with my R390 GT1 as it's been lying around for a month waiting for TS paints. It's seen about 5-7 coats of flat tamiya red as said about a month ago. Today when i started to mask so i could paint the inside silver i happened to remove a bit of the tape id applyed and would you know it......the paint followed the tape. This means basically that when i remove all the tape (tamiya's) its gonna tear away paint from all around the car.
Ive learnt something new today then....that you cannot mask over flat paints.
Later, Mike.:smoker2:

I have to ask you though, why was it painted flat red for a start, and did you prime it?
If you did prime it, was the primer a type that was compatable with the type of paint you used for the red?

I have masked over flat paints without a problem, more times than I can remember actually, so it sounds to me like you did something wrong there.

In MY experiences, flats don't stick well enough to metallics.
There's little adhesion quality to a metallic finish UNTIL you clear coat it.

ok, this is my first attempt at a two colored car. Since it's red & black i decided to paint (undercoat) everything in red first as it's easier to cover red with black than black with red. Then i thought i'd mask it up and use the red & black TS paints.

ok, i had primed it from the begining with gunze grey (this was my first primer purchase, wanted to try it) but the same thing happened there, the stuff just followed the tape. That's when i decided to remove the primer and just undercoat it with the red as mentioned above. STRANGE thing happened here though, even though id removed the primer and started to paint it red, black patches are coming through the red ?!?
WHY ???
Appreciate any help on this one.
Later, Mike.:smoker2:

How are you applying the red?
If you're airbrushing it, you could have a dirty airbrush.
Otherwise I don't know, not without knowing what you're actually doing.

Did you wash everything before you started painting?

Ok, forget all the the previous.......just give me some advice on the following.......
I usually...... wash off all parts etc then undercoat (with airbrush) 5-6 times with a near matching tamiya flat color then use TS spray bla bla bla.

Is it better to just prime and then TS spray the car and what's the difference between grey & white primer........apart from the obvious !!!

ps, Those who dont use primer, how do they undercoat ?!?

Appreciate your help.
Later, Mike.


:smoker2:

When you have to mask, you'd better sand the body with fine sand paper, such as 2000 grit, so that primer or undercoat grabs the surface better. Also, use only narrow masking tape, such as 5 mm near the boundary, and cover the rest with a tissue paper.

Right thank's

But why grey & white primer.....
When do i use grey & when do i use white and can i just prime & then paint with a TS color ......
Thanks.

I think white and grey primer are the same, except the color.
You use white primer for lighter body colors, that are not opaque enough, to hide the under coat.
In fact, I carefully choose the color of undercoat based on the body color, for example...

white primer -> yellow
white primer -> tan -> yellow
white primer -> orange -> yellow

These three will create diffferent results, and I think you get the idea.

Right then....so it's just primer then straight on with the tamiya spray can in future without any sort of undercoat. GOD ! all my acrylics are gonna last me for years now since before ive been using them as undercoat without primer.
Thanks

If you've been using acryllics under lacquers, I am surprised the paint has been adhering to the plastic at all.