diff --git a/OpenNest.WinForms.Tests/Controls/ActionSequenceByPathTests.cs b/OpenNest.WinForms.Tests/Controls/ActionSequenceByPathTests.cs
new file mode 100644
index 00000000..a05b7929
--- /dev/null
+++ b/OpenNest.WinForms.Tests/Controls/ActionSequenceByPathTests.cs
@@ -0,0 +1,60 @@
+using OpenNest.Actions;
+using OpenNest.CNC;
+using OpenNest.Controls;
+using OpenNest.Geometry;
+
+namespace OpenNest.WinForms.Tests.Controls;
+
+/// <summary>
+/// Sequence by Path mutes every part until a line reaches it, however the tool is started.
+/// </summary>
+public class ActionSequenceByPathTests
+{
+    private static PlateView View()
+    {
+        var drawing = new Drawing("square", Square());
+        var plate = new Plate(48, 48);
+        plate.Parts.Add(new Part(drawing, new Vector(2, 2)));
+        plate.Parts.Add(new Part(drawing, new Vector(20, 2)));
+        var view = new PlateView { Plate = plate, Size = new System.Drawing.Size(600, 600) };
+        view.ZoomToFit();
+        return view;
+    }
+
+    private static Program Square()
+    {
+        var program = new Program();
+        program.Codes.Add(new RapidMove(0, 0));
+        program.Codes.Add(new LinearMove(4, 0));
+        program.Codes.Add(new LinearMove(4, 4));
+        program.Codes.Add(new LinearMove(0, 4));
+        program.Codes.Add(new LinearMove(0, 0));
+        return program;
+    }
+
+    [Fact]
+    public void StartingTheToolMutesEveryPart() => StaTestThread.Run(() =>
+    {
+        using var view = View();
+
+        view.SetAction(typeof(ActionSequenceByPath));
+
+        Assert.All(view.Plate.Parts, part => Assert.Contains(part, view.MutedParts!));
+        view.SetAction(typeof(ActionSelect));
+        Assert.Null(view.MutedParts);
+    }, TimeSpan.FromMinutes(1), "The STA test did not complete.");
+
+    [Fact]
+    public void RestartingTheToolKeepsEveryPartMuted() => StaTestThread.Run(() =>
+    {
+        using var view = View();
+
+        view.SetAction(typeof(ActionSequenceByPath));
+        view.SetAction(typeof(ActionSequenceByPath));
+
+        Assert.NotNull(view.MutedParts);
+        Assert.All(view.Plate.Parts, part => Assert.Contains(part, view.MutedParts!));
+        view.SetAction(typeof(ActionSelect));
+        Assert.Null(view.MutedParts);
+    }, TimeSpan.FromMinutes(1), "The STA test did not complete.");
+}
diff --git a/OpenNest/Actions/ActionSequenceByPath.cs b/OpenNest/Actions/ActionSequenceByPath.cs
index be0a481f..366afc10 100644
--- a/OpenNest/Actions/ActionSequenceByPath.cs
+++ b/OpenNest/Actions/ActionSequenceByPath.cs
@@ -38,6 +38,11 @@ namespace OpenNest.Actions
         };
         private List<Vector> drawing;
         private bool disconnecting;
+        private IReadOnlySet<Part> muted;
+
+        // Starting the tool again builds the new one before this one is cancelled and
+        // disconnected, so this one must leave the view's muting to its successor.
+        private bool OwnsView => ReferenceEquals(plateView.MutedParts, muted);
 
         public override bool ResumeOnEscape => false;
 
@@ -69,6 +74,7 @@ namespace OpenNest.Actions
             plateView.KeyDown += plateView_KeyDown;
             plateView.Paint += plateView_Paint;
             UpdateMuted(lines);
+            plateView.Invalidate();
         }
 
         private void plateView_MouseDown(object sender, MouseEventArgs e)
@@ -182,13 +188,14 @@ namespace OpenNest.Actions
         /// <summary>Mutes the parts the lines do not reach, so what is left to sequence stands out.</summary>
         private void UpdateMuted(IReadOnlyList<IReadOnlyList<Vector>> paths)
         {
-            var muted = new HashSet<Part>(ReferenceEqualityComparer.Instance);
+            var unreached = new HashSet<Part>(ReferenceEqualityComparer.Instance);
             foreach (var part in plateView.Plate.Parts)
             {
                 if (!DrawnPathSequencing.Reaches(paths, part))
-                    muted.Add(part);
+                    unreached.Add(part);
             }
-            plateView.MutedParts = muted;
+            muted = unreached;
+            plateView.MutedParts = unreached;
         }
 
         private void plateView_Paint(object sender, PaintEventArgs e)
@@ -230,8 +237,11 @@ namespace OpenNest.Actions
             plateView.MouseUp -= plateView_MouseUp;
             plateView.KeyDown -= plateView_KeyDown;
             plateView.Paint -= plateView_Paint;
-            plateView.PreviewSequence = null;
-            plateView.MutedParts = null;
+            if (OwnsView)
+            {
+                plateView.PreviewSequence = null;
+                plateView.MutedParts = null;
+            }
             form.Close();
             form.Dispose();
             linePen.Dispose();
@@ -246,6 +256,8 @@ namespace OpenNest.Actions
         public override void CancelAction()
         {
             drawing = null;
+            if (!OwnsView)
+                return;
             plateView.PreviewSequence = null;
             UpdateMuted(lines);
             plateView.Invalidate();