diff --git a/Source/Examples/OpenCL/VectorAdd.cs b/Source/Examples/OpenCL/VectorAdd.cs
index d2cd1289..1f35c772 100644
--- a/Source/Examples/OpenCL/VectorAdd.cs
+++ b/Source/Examples/OpenCL/VectorAdd.cs
@@ -5,6 +5,7 @@ using OpenTK.Compute.CL10;
 
 namespace Examples
 {
+#if EXPERIMENTAL
     using cl_context = IntPtr;
     using cl_device_id = IntPtr;
     using cl_command_queue = IntPtr;
@@ -137,4 +138,5 @@ vectorAdd(__global const float * a,
             }
         }
     }
+#endif
 }
diff --git a/Source/Examples/OpenGLES/1.1/SimpleWindow.cs b/Source/Examples/OpenGLES/1.1/SimpleWindow.cs
index c28caa13..f54faae8 100644
--- a/Source/Examples/OpenGLES/1.1/SimpleWindow.cs
+++ b/Source/Examples/OpenGLES/1.1/SimpleWindow.cs
@@ -41,6 +41,7 @@ using OpenTK.Graphics.ES11;
 
 namespace Examples.Tutorial
 {
+#if EXPERIMENTAL
     [Example("Immediate mode", ExampleCategory.OpenGLES, "1.1", Documentation = "SimpleES11Window")]
     public class SimpleES11Window : GameWindow
     {
@@ -204,4 +205,5 @@ namespace Examples.Tutorial
 
         #endregion
     }
+#endif
 }
diff --git a/Source/OpenTK/Compute/CL10/CLHelper.cs b/Source/OpenTK/Compute/CL10/CLHelper.cs
index 0f8799db..8eacf10c 100644
--- a/Source/OpenTK/Compute/CL10/CLHelper.cs
+++ b/Source/OpenTK/Compute/CL10/CLHelper.cs
@@ -35,7 +35,10 @@ namespace OpenTK.Compute.CL10
     /// <summary>
     /// Provides access to the OpenCL 1.0 flat API.
     /// </summary>
-    public partial class CL : BindingsBase
+#if EXPERIMENTAL
+    public
+#endif
+    sealed partial class CL : BindingsBase
     {
         #region Fields
 
diff --git a/Source/OpenTK/Graphics/ES10/Helper.cs b/Source/OpenTK/Graphics/ES10/Helper.cs
index 16f87c7c..7be6c6cf 100644
--- a/Source/OpenTK/Graphics/ES10/Helper.cs
+++ b/Source/OpenTK/Graphics/ES10/Helper.cs
@@ -7,7 +7,10 @@ namespace OpenTK.Graphics.ES10
     /// <summary>
     /// Provides access to OpenGL ES 1.0 methods.
     /// </summary>
-    public sealed partial class GL : GraphicsBindingsBase
+#if EXPERIMENTAL
+    public
+#endif
+    sealed partial class GL : GraphicsBindingsBase
     {
         const string Library = "libGLES.dll";
         static readonly object sync_root = new object();
diff --git a/Source/OpenTK/Graphics/ES11/Helper.cs b/Source/OpenTK/Graphics/ES11/Helper.cs
index 49917848..bc439eec 100644
--- a/Source/OpenTK/Graphics/ES11/Helper.cs
+++ b/Source/OpenTK/Graphics/ES11/Helper.cs
@@ -9,7 +9,10 @@ namespace OpenTK.Graphics.ES11
     /// <summary>
     /// Provides access to OpenGL ES 1.1 methods.
     /// </summary>
-    public sealed partial class GL : GraphicsBindingsBase
+#if EXPERIMENTAL
+    public
+#endif
+    sealed partial class GL : GraphicsBindingsBase
     {
         const string Library = "libGLES.dll";
         static readonly object sync_root = new object();