Jump to content
Model Cars Magazine Forum

Defect in clear parts


Recommended Posts

On the Tamiya porsche 1/12 935. There are lines in the clear parts that I'm not sure what to do with. On the windshield and back glass there are lines going from top to bottom right in the middle. I thought they were scratches but I  sanded and polished them and they're better but still slightly visible. The side glass' have these weird curvy lines. I  have a backup kit for extra parts just in case and the clear parts have the same lines.

20220918_133059.jpg

20220918_133048.jpg

Link to comment
Share on other sites

10 minutes ago, 1972coronet said:

Since you'll likely have to find or make replacements, you may as well try coating them with Future [et al.] and see if that makes any difference.

I used that stuff on a paint job and it all cracked a few years later

Link to comment
Share on other sites

3 hours ago, Tabbysdaddy said:

That looks like swirls in the plastic from the injection molding process. I don't think I've ever seen that on clear parts before. 

That’s exactly what it is. It’s a result of the plastic flowing through the mold from different directions from different injectors. The plastic from one injector is colder than the other and setting up before it meets the plastic from the other injector resulting in a parting line throughout the part that unfortunately will not buff out. Bummer!

Link to comment
Share on other sites

On 9/18/2022 at 11:24 PM, Rick L said:

That’s exactly what it is. It’s a result of the plastic flowing through the mold from different directions from different injectors. The plastic from one injector is colder than the other and setting up before it meets the plastic from the other injector resulting in a parting line throughout the part that unfortunately will not buff out. Bummer!

To add a bit: that's why the best clear parts are molded form just a single injection point per part. That of course avoids the weld lines. Take a close look at different clear part sprues / runners to see what I mean.

Rob

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...