diff --git a/GameData/RP-1/Tree/PFTechLevels.cfg b/GameData/RP-1/Tree/PFTechLevels.cfg
index a082aea28f..5c5fcf8c4c 100644
--- a/GameData/RP-1/Tree/PFTechLevels.cfg
+++ b/GameData/RP-1/Tree/PFTechLevels.cfg
@@ -8,7 +8,7 @@ PARTUPGRADE
 	cost = 0
 	title = Aluminum Fairings and Stringers
 	manufacturer = Various
-	description = You can now use 1950s Aluminum stringer-stiffened fairings and stringers. The new minimum density is 0.155, compared with 0.180 at the previous tech level. NOTE: This is not a part you can use, it just symbolizes the new capabilities you can unlock. 
+	description = You can now use 1950s Aluminum stringer-stiffened fairings and stringers. The new minimum density is 0.135, compared with 0.180 for fairings and 0.300 for procedural structures at the previous tech level. NOTE: This is not a part you can use, it just symbolizes the new capabilities you can unlock. 
 }
 PARTUPGRADE
 {
@@ -19,7 +19,7 @@ PARTUPGRADE
 	cost = 0
 	title = Magnesium Fairings and Stringers
 	manufacturer = Various
-	description = You can now use 1960s Magnesium stringer-stiffened fairings and stringers. The new minimum density is 0.143, compared with 0.155 at the previous tech level. NOTE: This is not a part you can use, it just symbolizes the new capabilities you can unlock. 
+	description = You can now use 1960s Magnesium stringer-stiffened fairings and stringers. The new minimum density is 0.124, compared with 0.135 at the previous tech level. NOTE: This is not a part you can use, it just symbolizes the new capabilities you can unlock. 
 }
 PARTUPGRADE
 {
@@ -30,7 +30,7 @@ PARTUPGRADE
 	cost = 0
 	title = Fiberglass Fairings and Stringers
 	manufacturer = Various
-	description = You can now use late 1960s Fiberglass stringer-stiffened fairings and stringers. The new minimum density is 0.074, compared with 0.143 at the previous tech level. NOTE: This is not a part you can use, it just symbolizes the new capabilities you can unlock. 
+	description = You can now use late 1960s Fiberglass stringer-stiffened fairings and stringers. The new minimum density is 0.074, compared with 0.124 at the previous tech level. NOTE: This is not a part you can use, it just symbolizes the new capabilities you can unlock. 
 }
 PARTUPGRADE
 {
@@ -84,13 +84,13 @@ PARTUPGRADE
 			{
 				name__ = PFTech-Fairing-I
 				description__ = You can now use 1950s Aluminum stringer-stiffened fairings and stringers.
-				minDensity = 0.155
+				minDensity = 0.135
 			}
 			UPGRADE
 			{
 				name__ = PFTech-Fairing-II
 				description__ = You can now use 1960s Magnesium stringer-stiffened fairings and stringers.
-				minDensity = 0.143
+				minDensity = 0.124
 			}
 			UPGRADE
 			{