diff --git a/Engine/source/T3D/fx/particle.cpp b/Engine/source/T3D/fx/particle.cpp
index 2e331fb7f..ca8ead21f 100644
--- a/Engine/source/T3D/fx/particle.cpp
+++ b/Engine/source/T3D/fx/particle.cpp
@@ -149,10 +149,10 @@ void ParticleData::initPersistFields()
       "Variance in lifetime of particle, from 0 - lifetimeMS." );
    addField( "spinSpeed", TYPEID< F32 >(), Offset(spinSpeed, ParticleData),
       "Speed at which to spin the particle." );
-   addField( "spinRandomMin", TYPEID< F32 >(), Offset(spinRandomMin, ParticleData),
-      "Minimum allowed spin speed of this particle, between -10000 and spinRandomMax." );
-   addField( "spinRandomMax", TYPEID< F32 >(), Offset(spinRandomMax, ParticleData),
-      "Maximum allowed spin speed of this particle, between spinRandomMin and 10000." );
+   addFieldV( "spinRandomMin", TYPEID< F32 >(), Offset(spinRandomMin, ParticleData), new FRangeValidator(-1000.f, 1000.f),
+      "Minimum allowed spin speed of this particle, between -1000 and spinRandomMax." );
+   addFieldV( "spinRandomMax", TYPEID< F32 >(), Offset(spinRandomMax, ParticleData), new FRangeValidator(-1000.f, 1000.f),
+      "Maximum allowed spin speed of this particle, between spinRandomMin and 1000." );
    addField( "useInvAlpha", TYPEID< bool >(), Offset(useInvAlpha, ParticleData),
       "@brief Controls how particles blend with the scene.\n\n"
       "If true, particles blend like ParticleBlendStyle NORMAL, if false, "
@@ -200,7 +200,8 @@ void ParticleData::initPersistFields()
       "@brief Particle RGBA color keyframe values.\n\n"
       "The particle color will linearly interpolate between the color/time keys "
       "over the lifetime of the particle." );
-   addField( "sizes", TYPEID< F32 >(), Offset(sizes, ParticleData), PDC_NUM_KEYS,
+   addProtectedField( "sizes", TYPEID< F32 >(), Offset(sizes, ParticleData), &protectedSetSizes, 
+      &defaultProtectedGetFn, PDC_NUM_KEYS,
       "@brief Particle size keyframe values.\n\n"
       "The particle size will linearly interpolate between the size/time keys "
       "over the lifetime of the particle." );
@@ -343,6 +344,22 @@ void ParticleData::unpackData(BitStream* stream)
    }
 }
 
+bool ParticleData::protectedSetSizes( void *object, const char *index, const char *data) 
+{
+   ParticleData *pData = static_cast<ParticleData*>( object );
+   F32 val = dAtof(data);
+   U32 i;
+
+   if (!index)
+      i = 0;
+   else
+      i = dAtoui(index);
+
+   pData->sizes[i] = mClampF( val, 0.f, MaxParticleSize );
+
+   return false;
+}
+
 bool ParticleData::protectedSetTimes( void *object, const char *index, const char *data) 
 {
    ParticleData *pData = static_cast<ParticleData*>( object );
@@ -356,7 +373,7 @@ bool ParticleData::protectedSetTimes( void *object, const char *index, const cha
 
    pData->times[i] = mClampF( val, 0.f, 1.f );
 
-   return true;
+   return false;
 }
 
 //-----------------------------------------------------------------------------
@@ -379,11 +396,11 @@ bool ParticleData::onAdd()
       Con::warnf(ConsoleLogEntry::General, "ParticleData(%s) lifetimeVariance >= lifetime", getName());
       lifetimeVarianceMS = lifetimeMS - 1;
    }
-   if (spinSpeed > 10000.0 || spinSpeed < -10000.0) {
+   if (spinSpeed > 1000.f || spinSpeed < -1000.f) {
       Con::warnf(ConsoleLogEntry::General, "ParticleData(%s) spinSpeed invalid", getName());
       return false;
    }
-   if (spinRandomMin > 10000.0 || spinRandomMin < -10000.0) {
+   if (spinRandomMin > 1000.f || spinRandomMin < -1000.f) {
       Con::warnf(ConsoleLogEntry::General, "ParticleData(%s) spinRandomMin invalid", getName());
       spinRandomMin = -360.0;
       return false;
@@ -393,7 +410,7 @@ bool ParticleData::onAdd()
       spinRandomMin = spinRandomMax - (spinRandomMin - spinRandomMax );
       return false;
    }
-   if (spinRandomMax > 10000.0 || spinRandomMax < -10000.0) {
+   if (spinRandomMax > 1000.f || spinRandomMax < -1000.f) {
       Con::warnf(ConsoleLogEntry::General, "ParticleData(%s) spinRandomMax invalid", getName());
       spinRandomMax = 360.0;
       return false;
diff --git a/Engine/source/T3D/fx/particle.h b/Engine/source/T3D/fx/particle.h
index 3f1b7ff26..14db8c096 100644
--- a/Engine/source/T3D/fx/particle.h
+++ b/Engine/source/T3D/fx/particle.h
@@ -79,6 +79,7 @@ class ParticleData : public SimDataBlock
    StringTableEntry  textureName;
    GFXTexHandle      textureHandle;
 
+   static bool protectedSetSizes( void *object, const char *index, const char *data );
    static bool protectedSetTimes( void *object, const char *index, const char *data );
 
   public: