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Yes, it is a current limitation of the paintengine The dev team is working on the 2026 release that migrate the engine to GPU accelerated for ppp

Yes, this request was posted on our Mantis bug tracker web

To replicate it, just use the airbrush and make it really large and spray the entire sphere at the main viewport screenspace for a few seconds. The brush should be bigger than the mesh so it can wrap around without you moving the camera, like you are trying to airbrush both sides of the sphere so it is 1 consistent paint coating. In substance, Tri-planar projection will allow you to wrap airbrush from front, side and back side so that you have an even spray so theres no gaps or seams. Just wondering if there is something like that in 3d coat too, because I can't find it and it seems really useful.  How do you airbrush or paint a round object all the way around and have it smooth, consistent and seamless then without extra brush strokes? 

Just wondering then, so there's no way to just paint on the UV texture around / outside of the seams, is there? I feel like that would solve a lot of issues since this should be a really easy fix normally. Can you ask them to let that be a possibility, or is that just how the software works?

Try this video Hope this help

Sorry if this is something simple but struggling to find documentation. Followed this link's instructions but for some reason, any areas without UV's are gray. Curious if there's a proper way to make Layer 0 fully black upon export. https://3dcoat.com/documentation/manual/workspaces-rooms/paint/opacity-transparency/

Export as png model, not jpg teethBder.fbx

Sorry, I can't replicate this issue on 2026.1

I just opened the file you sent and it was still jaggy looking and bleeding involved. I even exported it out of 3d coat to blender to see if it actually changed, but the results were still poor. I didn't do anything else besides open the file. See below for screenshots inside 3dCoat and exported to Blender to view. 3D coat textura 2025.17 so the latest publically available one.

sorry, i am attaching the projects   cloth.3b teeth.3b

Can you zoom in on the texture editior, I can't see it clearly because its really small and I tried magnifying it but its still too small. Thats what I originally did, if you look at the original picture I have the islands separated by the gum and the teeth and when I used fill it created the jagged lines. How did you fill the color on the Texture Map editor so that it fully enclosed the islands without jagged edges or bleeding, because I have been trying all day with 10 different isolated islands and meshes and it doesn't work like the one you pictured. It leaves bleeding and jagged eges at it. Did you not use the fill tool on the UV texture? Can you explain exactly how you painted it so there was no edge bleeding. I need to know how to do this, its very important but its not working like intended.   Look at the clothing item FBX above, I am trying to do the same thing with that but its not working. Separated islands, with different colors for clean edges but it just bleeds. Can you show me how to do that with the clothing item above, this is affecting all my isolated islands.

The only way I found to keep same result was to separate the UV islands at seams edges. Look at the UV island on Texture Editor Panel, are more small the the original.   Anyway we need better padding option, similar to "UV Space Neighbor" on Substance Painter.  Feature request added. Thanks for point it up.  

Its not the mesh thats the problem, I just need to know how to wrap the airbrush around a model, it doesn't have to be this leg, it could be a normal sphere I just want to wrap brushes around an object like in Substance Painter with tri-planar brushing. This isn't a technical problem with the mesh, I am just asking how to airbrush around an object without a harsh line because theres no tutorial on it and the only solution I have found is erasing and repainting. Here is an example of what I mean, with the default 3d coat sphere with just the default airbrush in screen space..

Sorry, life got in the way again.  So I deleted the blend layer, created a new layer.  Tried the Opacity at 100 and at 0, makes no difference.  The paint brush will not lay any color down.  Really annoying.  

You are using 1 solid color, so that is not the problem because they already are bleeding into each other. It is when you try to use 2 separate colors that it becomes a problem. Theres no way to have perfectly clean edges where the borders of the seams meet. I sent you the edited UV version, so the teeth and gums aren't separated anymore because I couldn't fix it when they were.  here is a picture of what I am looking for after editing it in photoshop and blender. No bleeding, no blurring just perfectly clean edges where the two meet.ClothingItem_01.fbx I have attached the FBX for the clothing item on top. I have separated the trim borders with UV seams and the trims are different colors than the main clothing piece. It has to be 2 different colors, is there anyway I can just paint over it because its happening more than once. When I try to use a fill on the UV texture, it leaves the jagged parts. Using a different color on the trim, and a different fill color on the main mesh. I'm trying to create perfectly clean edges on these islands is what I am hoping for, it could be any 2 islands attached to each other. In Substance painter I can paint directly on the UV border to fix this, but it won't allow me to do that here. If you look at the clothing item I posted above, it has happened again. Is this just an issue with 3d coat not letting you paint the edges of isolated UV islands and around it? Using 3D Coat Textura 2025.17. ClothingItem_01.fbx

Morph Target & Morph Brush Equivalent in 3DCoatView the full article

Got it, I understand now. I’ll try some other tools in the Sculpt Room to see if I can achieve better results. Thanks for the explanation.

share the leg mesh model please 

I was testing your model, I can paint without the same issue (on v2026.1)   At export stage, I have set this padding values (Edit > Preferences)   This is the UVlayout provided   * project attached teeth.3b