Is it a possible ANTI-Yellowish Method?

[gwfalcon]

Hi Folks:

Regarding the Anti-yellowish issue, I searched many times and still can not find a very good answer. Do you think the following is feasible:

See the video:

(Time span: 3:10 -- 4:40)

which is expert sakura's skill to get rid of the dirt after line painting (sorry not sure what is the suitable term but you know what I mean). He use the POLISHING Compond to make the plastic become purely white again. He said it is actually polishing the current outside layer.

Do you guys think it is useful or feasible?

I actually has a 1/55 HiKaru skull leader with the yellowish chest so I need an answer for this anti-yellowish question.

BTW, another way I have heart is using toothpaste, is it really possible or just a joke?

Thx for your help.

[eugimon]

Anytime you use a polishing agent, like toothpaste, what you're doing is resurfacing the plastic... grinding away the layer that has yellowed and exposing plastic where the pigment has not been degraded.

[gwfalcon]

So that means it is a perfect method, assuming the grinding skill is ok enough.

I see the guy's grinding in the video, not so difficult.

[eugimon]

yes and no. It depends on why the plastic is weathering and how deeply it is affected. If the problem is due to inherently unstable plastic... say the pigment is just unstable and reacting to oxygen, then you can grind away pretty deeply and you're going to really affect the way the toy looks... the bigger the surface area, the more you'll need to work the surface to get it to look "right".

[RichyX]

do you mean items (plastics) that have already yellowed or when they yellow after painting

if the 1st then theres no way of reversing the yellowing no matter how much polish you do as its a chemical reaction within the plastic

[eugimon]

do you mean items (plastics) that have already yellowed or when they yellow after painting

if the 1st then theres no way of reversing the yellowing no matter how much polish you do as its a chemical reaction within the plastic

we're not talking about reversing yellowing, we're talking about polishing (re-surfacing) the layer of plastic that has yellowed.

[Excillon]

Just like to add that if your grinding plastic and using something abrasive like toothpaste, keep your RPM's way down or you could do considerable heat damage.