diff --git a/src/world/gunk_body/gunk_body.gd b/src/world/gunk_body/gunk_body.gd
index 933b524..4ba86f9 100644
--- a/src/world/gunk_body/gunk_body.gd
+++ b/src/world/gunk_body/gunk_body.gd
@@ -16,7 +16,6 @@ const CLEAR_TOTAL_EPSILON := 1
 @export var initial_mask: Texture
 
 @export var source_gunk_material: ShaderMaterial
-@export var material_surface: int = 0
 
 var meshtool := MeshDataTool.new()
 
@@ -57,12 +56,8 @@ func _ready() -> void:
 	var mat_instance: ShaderMaterial = source_gunk_material.duplicate()
 	# Set material gunk mask to our mask viewport texture
 	mat_instance.set_shader_parameter("gunk_mask", mask_viewport.get_texture())
-	# Set gunk material as the next-pass material of the base surface material
-	# Iterate through material passes to the end
-	var base_mat := mesh_instance.mesh.surface_get_material(material_surface)
-	while base_mat.next_pass:
-		base_mat = base_mat.next_pass
-	base_mat.next_pass = mat_instance
+	# Overlay mesh with gunk material
+	mesh_instance.material_overlay = mat_instance
 
 	if initial_mask:
 		mask_texture.texture = initial_mask