diff --git a/bootstrap/rig-system/kustomize/overlays/odcn-production/argocd-application-production-infrastructure.yaml b/bootstrap/rig-system/kustomize/overlays/odcn-production/argocd-application-production-infrastructure.yaml
index e7219a6b..755885e5 100644
--- a/bootstrap/rig-system/kustomize/overlays/odcn-production/argocd-application-production-infrastructure.yaml
+++ b/bootstrap/rig-system/kustomize/overlays/odcn-production/argocd-application-production-infrastructure.yaml
@@ -7,7 +7,7 @@ metadata:
 #  annotations:
 #    argocd.argoproj.io/sync-wave: "1"  # Deploy before user applications
 spec:
-  project: default
+  project: rig-platform
   source:
     repoURL: https://infrastructure@github.com/RijksICTGilde/RIG-Cluster.git
     path: infrastructure/bootstrap/clusters/odcn
diff --git a/bootstrap/rig-system/kustomize/overlays/odcn-production/argocd-application-user-applications.yaml b/bootstrap/rig-system/kustomize/overlays/odcn-production/argocd-application-user-applications.yaml
index ea5eb119..efabe960 100644
--- a/bootstrap/rig-system/kustomize/overlays/odcn-production/argocd-application-user-applications.yaml
+++ b/bootstrap/rig-system/kustomize/overlays/odcn-production/argocd-application-user-applications.yaml
@@ -6,7 +6,7 @@ metadata:
   annotations:
     argocd.argoproj.io/sync-wave: "2"  # Deploy after infrastructure
 spec:
-  project: default
+  project: rig-platform
   sources:
     - repoURL: https://user-applications@github.com/RijksICTGilde/argo-applications.git
       path: odcn-production
diff --git a/bootstrap/rig-system/kustomize/overlays/odcn-production/argocd-appproject-rig-platform.yaml b/bootstrap/rig-system/kustomize/overlays/odcn-production/argocd-appproject-rig-platform.yaml
new file mode 100644
index 00000000..4f0f5c21
--- /dev/null
+++ b/bootstrap/rig-system/kustomize/overlays/odcn-production/argocd-appproject-rig-platform.yaml
@@ -0,0 +1,33 @@
+# AppProject — vervangt het ingebouwde 'default' project voor de twee
+# productie-Applications. Pint sourceRepos + destinations zodat een
+# willekeurige push naar een andere repo niet automatisch in productie landt.
+apiVersion: argoproj.io/v1alpha1
+kind: AppProject
+metadata:
+  name: rig-platform
+  namespace: rig-system
+  finalizers:
+    - resources-finalizer.argocd.argoproj.io
+spec:
+  description: Beperkt project voor de productie-Applications.
+
+  sourceRepos:
+    - https://infrastructure@github.com/RijksICTGilde/RIG-Cluster.git
+    - https://user-applications@github.com/RijksICTGilde/argo-applications.git
+
+  # Beide Applications syncen alleen naar rig-prd-operations (live geverifieerd).
+  destinations:
+    - server: https://kubernetes.default.svc
+      namespace: rig-prd-operations
+
+  # Cluster-scoped beheert ODCN; namespaced open want destinations pint de scope.
+  clusterResourceWhitelist: []
+  namespaceResourceWhitelist:
+    - group: "*"
+      kind: "*"
+
+  # Warn uit: rig-prd-operations bevat ook bootstrap-resources (Argo, OPI,
+  # Keycloak, Postgres, etc.) die niet door Argo gemanaged zijn — namespace-
+  # opsplitsing is follow-up #106.
+  orphanedResources:
+    warn: false
diff --git a/bootstrap/rig-system/kustomize/overlays/odcn-production/kustomization.yaml b/bootstrap/rig-system/kustomize/overlays/odcn-production/kustomization.yaml
index a0af0ddf..6a9c16c2 100644
--- a/bootstrap/rig-system/kustomize/overlays/odcn-production/kustomization.yaml
+++ b/bootstrap/rig-system/kustomize/overlays/odcn-production/kustomization.yaml
@@ -11,6 +11,7 @@ resources:
 - argocd-deployment.yaml
 - network-policies/argocd-network-policy.yaml
 - ../../operations-manager/overlays/odcn-production
+- argocd-appproject-rig-platform.yaml
 - argocd-application-production-infrastructure.yaml
 - argocd-application-user-applications.yaml
 
diff --git a/bootstrap/rig-system/kustomize/overlays/sandboxed-local/argocd-application-infrastructure.yaml b/bootstrap/rig-system/kustomize/overlays/sandboxed-local/argocd-application-infrastructure.yaml
index b33b1db9..0f909ec4 100644
--- a/bootstrap/rig-system/kustomize/overlays/sandboxed-local/argocd-application-infrastructure.yaml
+++ b/bootstrap/rig-system/kustomize/overlays/sandboxed-local/argocd-application-infrastructure.yaml
@@ -5,7 +5,7 @@ metadata:
   name: sandbox-infrastructure
   namespace: rig-system
 spec:
-  project: default
+  project: rig-platform
   source:
     repoURL: http://forgejo.rig-system.svc.cluster.local:3000/rig-admin/zad-argo-infrastructure.git
     path: bootstrap/clusters/sandboxed-local
diff --git a/bootstrap/rig-system/kustomize/overlays/sandboxed-local/argocd-application-user-applications.yaml b/bootstrap/rig-system/kustomize/overlays/sandboxed-local/argocd-application-user-applications.yaml
index ba82d887..162f7717 100644
--- a/bootstrap/rig-system/kustomize/overlays/sandboxed-local/argocd-application-user-applications.yaml
+++ b/bootstrap/rig-system/kustomize/overlays/sandboxed-local/argocd-application-user-applications.yaml
@@ -5,7 +5,7 @@ metadata:
   name: user-applications
   namespace: rig-system
 spec:
-  project: default
+  project: rig-platform
   sources:
     - repoURL: http://forgejo.rig-system.svc.cluster.local:3000/rig-admin/zad-argo-user-applications.git
       path: .
diff --git a/bootstrap/rig-system/kustomize/overlays/sandboxed-local/argocd-appproject-rig-platform.yaml b/bootstrap/rig-system/kustomize/overlays/sandboxed-local/argocd-appproject-rig-platform.yaml
new file mode 100644
index 00000000..5526dbf1
--- /dev/null
+++ b/bootstrap/rig-system/kustomize/overlays/sandboxed-local/argocd-appproject-rig-platform.yaml
@@ -0,0 +1,29 @@
+# AppProject — sandbox-variant van rig-platform; spiegelt odcn-production
+# overlay maar pint op de sandbox repos (Forgejo in-cluster) en rig-system.
+apiVersion: argoproj.io/v1alpha1
+kind: AppProject
+metadata:
+  name: rig-platform
+  namespace: rig-system
+  finalizers:
+    - resources-finalizer.argocd.argoproj.io
+spec:
+  description: Beperkt project voor de sandbox-Applications.
+
+  sourceRepos:
+    - http://forgejo.rig-system.svc.cluster.local:3000/rig-admin/zad-argo-infrastructure.git
+    - http://forgejo.rig-system.svc.cluster.local:3000/rig-admin/zad-argo-user-applications.git
+
+  destinations:
+    - server: https://kubernetes.default.svc
+      namespace: rig-system
+
+  clusterResourceWhitelist: []
+  namespaceResourceWhitelist:
+    - group: "*"
+      kind: "*"
+
+  # Warn uit: rig-system bevat ook bootstrap-resources (Argo, OPI, Keycloak,
+  # Forgejo) die niet door Argo gemanaged zijn — namespace-opsplitsing is #106.
+  orphanedResources:
+    warn: false
diff --git a/bootstrap/rig-system/kustomize/overlays/sandboxed-local/kustomization.yaml b/bootstrap/rig-system/kustomize/overlays/sandboxed-local/kustomization.yaml
index 196a7d70..aa7ba0b8 100644
--- a/bootstrap/rig-system/kustomize/overlays/sandboxed-local/kustomization.yaml
+++ b/bootstrap/rig-system/kustomize/overlays/sandboxed-local/kustomization.yaml
@@ -14,6 +14,7 @@ resources:
 - argocd-deployment.yaml
 - argocd-admin-secret.yaml
 - argocd-repo-forgejo-secret.yaml
+- argocd-appproject-rig-platform.yaml
 - argocd-application-infrastructure.yaml
 - argocd-application-user-applications.yaml
 - ../../operations-manager/overlays/sandboxed-local