diff --git a/CADability.Forms/CadCanvas.cs b/CADability.Forms/CadCanvas.cs
index b37d6969..b9cb90f1 100644
--- a/CADability.Forms/CadCanvas.cs
+++ b/CADability.Forms/CadCanvas.cs
@@ -51,7 +51,9 @@ private static CADability.Substitutes.PaintEventArgs Subst(System.Windows.Forms.
             return new Substitutes.PaintEventArgs()
             {
                 ClipRectangle = v.ClipRectangle,
+#pragma warning disable CS0618 // still set for views of applications that read it, until CADability 2.0
                 Graphics = v.Graphics
+#pragma warning restore CS0618
             };
         }
         private IView view;
diff --git a/CADability/FormsSubst.cs b/CADability/FormsSubst.cs
index 7af57951..160686e3 100644
--- a/CADability/FormsSubst.cs
+++ b/CADability/FormsSubst.cs
@@ -74,6 +74,11 @@ public KeyEventArgs(Keys keyData)
     public class PaintEventArgs 
     {
         public Rectangle ClipRectangle { get; set; }
+        /// <summary>
+        /// The GDI+ graphics of the paint event. No view of CADability reads it: views paint through
+        /// <see cref="ICanvas.PaintTo3D"/>.
+        /// </summary>
+        [Obsolete("No view of CADability uses it. Paint through ICanvas.PaintTo3D instead. GDI+ is removed from the kernel in CADability 2.0 (issue #412).")]
         public Graphics Graphics { get; set; }
     }
 
diff --git a/CADability/ModelView.cs b/CADability/ModelView.cs
index 1cda0368..b0969768 100644
--- a/CADability/ModelView.cs
+++ b/CADability/ModelView.cs
@@ -3013,6 +3013,7 @@ public void Scroll(int HScrollOffset, int VScrollOffset)
 		/// Not implemented: always returns null. Kept for compatibility with earlier versions.
 		/// </summary>
 		/// <returns>null</returns>
+		[Obsolete("Not implemented, always returns null. Use CADability.Forms.PaintToOpenGL.PaintToBitmap to render the model into a bitmap. GDI+ is removed from the kernel in CADability 2.0 (issue #412).")]
 		public Bitmap GetContentsAsBitmap()
 		{
 			{
diff --git a/CADability/PaintToOpenGl.cs b/CADability/PaintToOpenGl.cs
index ebd01fe3..30c8b771 100644
--- a/CADability/PaintToOpenGl.cs
+++ b/CADability/PaintToOpenGl.cs
@@ -657,6 +657,7 @@ internal static void InvokeSetProjection(IntPtr renderContext, IPaintTo3D paintT
         /// <param name="height">of the bitmap</param>
         /// <param name="extent">the extent to show in the bitmap; if null, the extent of the objects is used</param>
         /// <returns></returns>
+        [Obsolete("Not implemented in the kernel, always throws a NotImplementedException. Use CADability.Forms.PaintToOpenGL.PaintToBitmap with the same parameters instead. GDI+ is removed from the kernel in CADability 2.0 (issue #412).")]
         public static Bitmap PaintToBitmap(GeoObjectList list, GeoVector viewDirection, int width, int height, BoundingCube? extent = null)
         {
             throw new NotImplementedException("PaintToBitmap not implemented, maybe implement in CADability.Forms");