diff --git a/core/resources/l10n/messages.properties b/core/resources/l10n/messages.properties
index 5d88d8684..52da181a0 100644
--- a/core/resources/l10n/messages.properties
+++ b/core/resources/l10n/messages.properties
@@ -1506,10 +1506,14 @@ material.tubular_nylon_25_mm_1_in = Tubular nylon (25 mm, 1 in)
 
 ! ExternalComponent
 ExternalComponent.Rough = Rough
+ExternalComponent.Roughunfinished = Rough unfinished
 ExternalComponent.Unfinished = Unfinished
 ExternalComponent.Regularpaint = Regular paint
 ExternalComponent.Smoothpaint = Smooth paint
-ExternalComponent.Polished = Polished
+ExternalComponent.Optimumpaint = Optimum paint
+ExternalComponent.Polished = Aircraft sheet-metal
+ExternalComponent.Finishedpolished = Finished/polished surface
+ExternalComponent.Mirror = Mirror surface
 
 ! LineStyle
 LineStyle.Solid = Solid
diff --git a/core/src/net/sf/openrocket/rocketcomponent/ExternalComponent.java b/core/src/net/sf/openrocket/rocketcomponent/ExternalComponent.java
index ac2aeaf96..78d08cb73 100644
--- a/core/src/net/sf/openrocket/rocketcomponent/ExternalComponent.java
+++ b/core/src/net/sf/openrocket/rocketcomponent/ExternalComponent.java
@@ -22,14 +22,22 @@ public abstract class ExternalComponent extends RocketComponent {
 	public enum Finish {
 		//// Rough
 		ROUGH("ExternalComponent.Rough", 500e-6),
+		//// Rough unfinished
+		ROUGHUNFINISHED("ExternalComponent.Roughunfinished", 250e-6),
 		//// Unfinished
 		UNFINISHED("ExternalComponent.Unfinished", 150e-6),
 		//// Regular paint
 		NORMAL("ExternalComponent.Regularpaint", 60e-6),
 		//// Smooth paint
 		SMOOTH("ExternalComponent.Smoothpaint", 20e-6),
+		//// Optimum paint
+		OPTIMUM("ExternalComponent.Optimumpaint", 5e-6),
 		//// Polished
-		POLISHED("ExternalComponent.Polished", 2e-6);
+		POLISHED("ExternalComponent.Polished", 2e-6),
+		//// Optimum paint
+		FINISHPOLISHED("ExternalComponent.Finishedpolished", .5e-6),
+		//// Optimum paint
+		MIRROR("ExternalComponent.Mirror", 0.0e-6);
 		
 		private static final Translator trans = Application.getTranslator();
 		private final String name;