Author Topic: How to remove those uneven "pattern" or lines from  (Read 3577 times)

March 24, 2006, 01:37:03 AM
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T1000

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You know those "patterns" or lines which those big plastic parts have, like some kind of mold pattern? How to remove them? Because normally they will show up very clearly on a gloss surface.  :?

Do I just sand them, or have to apply putty then sand?

Because my next kit will be truely glossy and I do not want those pecky "patterns" to show up on my part surface to tell people - "Hey this is plastic after all!!"..

Any help?

March 24, 2006, 05:34:39 AM
Reply #1

FichtenFoo

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Can you take a picture of what you mean?

March 24, 2006, 08:25:17 AM
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Major Blah

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I think they are called "sink mark", those little wavy lines/patterns on bigger parts you mentioned.

From lots of the in-progs I've seen on the web, some use putty to fill the surface, then sanded smooth.

March 24, 2006, 08:35:51 AM
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FichtenFoo

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Maybe... he could mean injector marks or flash too. Every model part has a little... especially on rounded parts. For injector marks and sinks, add some Mr. Surfacer in a jar and sand smooth when dry. For flash, sand flush with surface.

flash:

injector marks:

March 24, 2006, 09:09:37 AM
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fulcy

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I believe, what he is talking about, are the swirly wavy designs (for lack of a better word) that are in larger parts - basically, it's the point where plastic has been injected into a large part from multiple points, and the plastic is almost too cool - it's still forms a solid part, but there are swirlies that are evident, especially in larger colored parts.

March 24, 2006, 09:15:21 AM
Reply #5

FichtenFoo

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Oh... those usually are not visible after a coat of primer and paint.

March 24, 2006, 10:40:53 AM
Reply #6

gamerabaenre

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If you can feel a little bump, then you really should sand it.

I've been playing with glossy finishes of late and here is my process.

Initial sanding to get the piece prepared for primer.  Prime using mr surfacer 1000 or 1200.  After the primer is dry, 4-6 hours; wet sand using a very high grit sand paper like 4000 or even higher.  This should polish up your primer and piece so that it's ready for paint.

Paint.  If you find uneven places, let the paint cure - 1 day to a week depending on the paint type.  Return to the part and wet sand using 4000-8000 grit sand paper.  This should smooth out your paint.  If you rub some paint off, just spray the same color back on (reasons to keep extra paint if you made a custom color)

Once the paint is done, spray on your gloss coat.  The first coat may look a little rough, this is normal.  Spray on a couple of more light coats giving some time between coats to dry- a couple of minutes will be fine.  Or you can return to the part every day and spray on a coat.  Most clear coats are self leveling, so the more clear coat you put on, the more glass like surface you will get.  You will also get more depth to the piece with more coats of gloss coat.  Hopefully this helps.

March 26, 2006, 07:01:44 PM
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T1000

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Hey those are the marks I meant!! Thanks for the advise.

I intend to use surfacer 500 to fill up those marks and then sand them using grit 400, followed by grit 600, then grit 1500 to smoothen the surface.

Hope that will work.
 8)

March 26, 2006, 07:04:09 PM
Reply #8

FichtenFoo

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Quote from: "T1000"
Hey those are the marks I meant!!


Which ones? Just so we all know what ones you were referring to. :wink:

April 01, 2006, 07:28:19 AM
Reply #9

T1000

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Quote from: "FichtenFoo"
Quote from: "T1000"
Hey those are the marks I meant!!


Which ones? Just so we all know what ones you were referring to. :wink:


sink marks, flash and also those small little circles in those plastics which u have shown in your pics.