Timonator Posted September 18, 2022 Share Posted September 18, 2022 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. Quote Link to comment Share on other sites More sharing options...
Tabbysdaddy Posted September 18, 2022 Share Posted September 18, 2022 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. 1 Quote Link to comment Share on other sites More sharing options...
Ace-Garageguy Posted September 18, 2022 Share Posted September 18, 2022 Easy enough to make replacements from PET or clear styrene or acetate sheet... Quote Link to comment Share on other sites More sharing options...
Fat Brian Posted September 18, 2022 Share Posted September 18, 2022 Ideally you could get replacements but I've never tried from Tamiya before. Someone is selling that parts tree on ebay right now but it'll be $70 to get it. Unfortunately that looks like a defect that won't polish out. Quote Link to comment Share on other sites More sharing options...
1972coronet Posted September 18, 2022 Share Posted September 18, 2022 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. Quote Link to comment Share on other sites More sharing options...
Timonator Posted September 18, 2022 Author Share Posted September 18, 2022 1 hour ago, Ace-Garageguy said: Easy enough to make replacements from PET or clear styrene or acetate sheet... How ? What do I need for that ? Quote Link to comment Share on other sites More sharing options...
Timonator Posted September 18, 2022 Author Share Posted September 18, 2022 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 Quote Link to comment Share on other sites More sharing options...
1972coronet Posted September 18, 2022 Share Posted September 18, 2022 1 minute ago, Timonator said: I used that stuff on a paint job and it all cracked a few years later That stinks, man. I've used it for years with no negative effects -- but, I've always used it on 'glass', plating, and bare plastic. Quote Link to comment Share on other sites More sharing options...
Raoul Ross Posted September 18, 2022 Share Posted September 18, 2022 I'd bet if you contacted Tamiya about this they would take of it. That's the first thing I'd do. Quote Link to comment Share on other sites More sharing options...
Ace-Garageguy Posted September 18, 2022 Share Posted September 18, 2022 56 minutes ago, Raoul Ross said: I'd bet if you contacted Tamiya about this they would take of it. That's the first thing I'd do. Best advice so far... Quote Link to comment Share on other sites More sharing options...
jaymcminn Posted September 18, 2022 Share Posted September 18, 2022 Definitely contact Tamiya. I think the 935 is either in the current catalog or recently rereleased. My 934 had a thin mold line in the windshield but nothing like that. Quote Link to comment Share on other sites More sharing options...
Rick L Posted September 18, 2022 Share Posted September 18, 2022 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! Quote Link to comment Share on other sites More sharing options...
Timonator Posted September 18, 2022 Author Share Posted September 18, 2022 I will definitely contact them but I'm trying to get it finished for the Atlanta show. Quote Link to comment Share on other sites More sharing options...
robdebie Posted September 20, 2022 Share Posted September 20, 2022 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 Quote Link to comment Share on other sites More sharing options...
Timonator Posted September 20, 2022 Author Share Posted September 20, 2022 I contacted Tamiya and they said that it must have been done on a Monday and that they would send me new ones. But I am skeptical since my old release kit and new release version both have it. Quote Link to comment Share on other sites More sharing options...
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