Thanks for your comments Marc.
Ok, first you need to know that there is no rule about casting turrets and if you take the T-34 for example, there are about 10 different models of turret built with different techniques (welded steel plates, two pârt casting, four part casting, etc...) with different molding qualities and mold forms. Depending on which mold was used at which factory, during or after the war. You really have to make an extensive research to be fully accurate.
For my tank, I haven't completed the research yet cause I was not at that step but I saw several pictures of the fact. no.174 one and I must say I'll have to add some texture cause the finish was really rough on these things.
The line you see on the turret is a seam line on the existing turret but it is too clean to be used as is. I might modify it using Apoxie Sculpt.
Let's say that line is a mold line from the kit and shouldn't be there. I would simply scrape it off with my x-acto knife and/or sandpaper and then I could add texture with a dremel rotary tool. The idea is to gently touch the surface for a second here and there to damage the surface lightly.
Get some practice on a piece of styrene first. It's not hard but you need to get it right on the model so ....
Hope this is of some help.
Yann
No matter where you go ....... there you are.