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diff --git a/Assets/Scenes/SampleScene.unity b/Assets/Scenes/SampleScene.unity
index ba30491..1d92169 100644
--- a/Assets/Scenes/SampleScene.unity
+++ b/Assets/Scenes/SampleScene.unity
@@ -2038,6 +2038,10 @@ MonoBehaviour:
   brushMasks:
   - {fileID: 2800000, guid: d07c01c40cc7be54da0ff3ae52484cd2, type: 3}
   - {fileID: 2800000, guid: ccc205272b051834eb39593f647c7bf1, type: 3}
+  - {fileID: 2800000, guid: 04bc55e2853356e4f999b995d0066b33, type: 3}
+  - {fileID: 2800000, guid: 25780adbe09da488ba079bc33c4bbf0f, type: 3}
+  - {fileID: 2800000, guid: 25780adbe09da488ba079bc33c4bbf0f, type: 3}
+  - {fileID: 2800000, guid: 25780adbe09da488ba079bc33c4bbf0f, type: 3}
   activeBrushIndex: 0
   brushAlignment: 0
   brushRotation: 0
@@ -3354,13 +3358,13 @@ CharacterController:
   m_ProvidesContacts: 0
   m_Enabled: 1
   serializedVersion: 3
-  m_Height: 1
+  m_Height: 0.95
   m_Radius: 0.1
   m_SlopeLimit: 59
-  m_StepOffset: 0.3
+  m_StepOffset: 0.15
   m_SkinWidth: 0.01
   m_MinMoveDistance: 0.001
-  m_Center: {x: 0, y: 0.48, z: 0}
+  m_Center: {x: 0, y: 0.49, z: 0}
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   m_ObjectHideFlags: 0
@@ -3401,7 +3405,7 @@ MonoBehaviour:
   wallOffsetFollow: 12
   wallExitGrace: 0.15
   ceilingGrabDistance: 0.3
-  wallTopOutBoost: 0.5
+  wallTopOutBoost: 0.3
   cameraOrbit: {fileID: 0}
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diff --git a/Assets/Scripts/MeshPainter.Gpu.cs b/Assets/Scripts/MeshPainter.Gpu.cs
index de465a5..f4fcd74 100644
--- a/Assets/Scripts/MeshPainter.Gpu.cs
+++ b/Assets/Scripts/MeshPainter.Gpu.cs
@@ -78,18 +78,46 @@ public partial class MeshPainter
         if (mi == MAP_MSO)
         {
             // Canonical (R=metallic, G=occlusion, A=smoothness) -> work layout
-            // (R=metallic, G=smoothness, B=occlusion); UploadColorsToRT fills A = island coverage.
+            // (R=metallic, G=smoothness, B=occlusion). Alpha = coverage, stamped below.
             var work = new Color32[src.Length];
             for (int i = 0; i < src.Length; i++) work[i] = new Color32(src[i].r, src[i].a, src[i].g, 0);
             UploadColorsToRT(work, gm.display, linear: true);
+            StampCoverage(gm.display);
             PackMs(gm); // build the final mask RT once so the material shows the seeded values
         }
         else
         {
             UploadColorsToRT((Color32[])src.Clone(), gm.display, linear: gm.sRGB == false);
+            StampCoverage(gm.display);
         }
     }
 
+    /// <summary>
+    /// Stamps the dilation coverage guard into a map's alpha: rasterizes the mesh with the brush
+    /// shader's coverage pass (pass 1), writing alpha = 1 on exactly the texels the GPU brush can
+    /// paint. This replaces the CPU island-mask approximation, whose generous edge tolerance marked
+    /// sub-pixel island borders as protected even though the brush never reaches them - so they
+    /// could never be overpainted (stayed frozen at their seeded value) while the dilation guarded
+    /// them. With a GPU-accurate guard those border texels fall in the gutter (alpha 0) and dilation
+    /// overpaints them normally. Texels stay alpha 0 until reached, identical to the brush.
+    /// </summary>
+    private void StampCoverage(RenderTexture rt)
+    {
+        if (!_brushMat || !_bakedMesh) return;
+        var prev = RenderTexture.active;
+        Graphics.SetRenderTarget(rt);
+        if (_brushMat.SetPass(1))
+        {
+            int sub = _bakedMesh.subMeshCount;
+            for (int i = 0; i < sub; i++) Graphics.DrawMeshNow(_bakedMesh, Matrix4x4.identity, i);
+        }
+        else
+        {
+            Debug.LogError("[MeshPainter] Brush coverage pass (pass 1) missing - dilation guard not seeded.", this);
+        }
+        RenderTexture.active = prev;
+    }
+
     private void TeardownGpu()
     {
         if (_gpu != null)
@@ -124,16 +152,13 @@ public partial class MeshPainter
         return rt;
     }
 
-    /// <summary>Writes Color32 data into a RenderTexture via a temporary texture.</summary>
+    /// <summary>Writes Color32 RGB into a RenderTexture via a temporary texture. Alpha (the
+    /// dilation coverage marker) is cleared to 0 here and stamped afterwards by StampCoverage,
+    /// so the guard matches the GPU rasterizer exactly (see SeedGpuMap).</summary>
     private void UploadColorsToRT(Color32[] colors, RenderTexture rt, bool linear)
     {
         var tmp = new Texture2D(textureSize, textureSize, TextureFormat.RGBA32, false, linear);
-        // Alpha is the dilation coverage marker: island texels (real content) = 255 so the
-        // dilate pass keeps them; the gutter = 0 so it stays paddable. Driving this from the UV
-        // islands (not a flat "unpainted") protects seeded content from the first stroke's bleed.
-        var island = GetIslandMask();
-        bool useMask = island.Length == colors.Length;
-        for (int i = 0; i < colors.Length; i++) colors[i].a = (useMask && island[i]) ? (byte)255 : (byte)0;
+        for (int i = 0; i < colors.Length; i++) colors[i].a = 0;
         tmp.SetPixels32(colors);
         tmp.Apply(false);
 
diff --git a/Assets/Shaders/MeshPaintBrush.shader b/Assets/Shaders/MeshPaintBrush.shader
index a7ff0f0..348f379 100644
--- a/Assets/Shaders/MeshPaintBrush.shader
+++ b/Assets/Shaders/MeshPaintBrush.shader
@@ -103,6 +103,42 @@ Shader "Hidden/MeshPaintBrush"
             }
             ENDCG
         }
+
+        // Pass 1 - coverage: rasterizes the mesh in UV space (identical vertex transform to
+        // the brush) and writes alpha = 1 on exactly the texels the brush can paint. Used to
+        // seed the dilation guard (display RT alpha) so it matches the GPU rasterizer instead
+        // of a CPU point-in-triangle approximation. Texels the brush can never reach (sub-pixel
+        // island borders) stay alpha = 0 -> the gutter, so dilation can still overpaint them.
+        Pass
+        {
+            ZTest Always
+            ZWrite Off
+            Cull Off
+            Blend Off
+            ColorMask A
+
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+            #include "UnityCG.cginc"
+
+            struct appdata { float4 vertex : POSITION; float2 uv : TEXCOORD0; };
+            struct v2f { float4 pos : SV_POSITION; };
+
+            v2f vert (appdata v)
+            {
+                v2f o;
+                float2 p = v.uv * 2.0 - 1.0;
+                #if UNITY_UV_STARTS_AT_TOP
+                    p.y = -p.y;
+                #endif
+                o.pos = float4(p, 0.0, 1.0);
+                return o;
+            }
+
+            fixed4 frag (v2f i) : SV_Target { return fixed4(0, 0, 0, 1); }
+            ENDCG
+        }
     }
     Fallback Off
 }