dissolving shader help

OK I'm trying to create a cool death effect for my "Alien Zombie". I'm using the Dissolve shader from the Wiki:

// simple "dissolving" shader by genericuser (radware.wordpress.com)
// clips materials, using an image as guidance.
// use clouds or random noise as the slice guide for best results.
  Shader "Custom Shaders/Dissolving" {
    Properties {
      _MainTex ("Texture (RGB)", 2D) = "white" {}
      _SliceGuide ("Slice Guide (RGB)", 2D) = "white" {}
      _SliceAmount ("Slice Amount", Range(0.0, 1.0)) = 0.5
    }
    SubShader {
      Tags { "RenderType" = "Opaque" }
      Cull Off
      CGPROGRAM
      //if you're not planning on using shadows, remove "addshadow" for better performance
      #pragma surface surf Lambert addshadow
      struct Input {
          float2 uv_MainTex;
          float2 uv_SliceGuide;
          float _SliceAmount;
      };
      sampler2D _MainTex;
      sampler2D _SliceGuide;
      float _SliceAmount;
      void surf (Input IN, inout SurfaceOutput o) {
          clip(tex2D (_SliceGuide, IN.uv_SliceGuide).rgb - _SliceAmount);
          o.Albedo = tex2D (_MainTex, IN.uv_MainTex).rgb;
      }
      ENDCG
    } 
    Fallback "Diffuse"
  }

I have it as a material on my "Alien Zombie" dead replacement... but it dissolves too quickly! Is there a way to slow the dissolve and delay it so it only dissolves a certain amount of time after the body has dropped to the ground?

And secondly how can I make it look sort of like the old TV series "The Invaders" when those alien died? And then destroy my dead alien body a short time after that?

I think on the destroy my dead alien I can just use a wait for seconds, but the rest I've got no clue how to do... has anyone done a cool effect like this and if so how did you do it?

EDIT here is where I keep trying to make my adjustment to slow the effect down but nothing happens?

Shader "Custom Shaders/Dissolving" {
    Properties {
      _MainTex ("Texture (RGB)", 2D) = "white" {}
      _SliceGuide ("Slice Guide (RGB)", 2D) = "white" {}
      _SliceAmount ("Slice Amount", Range(0.0, 1.0)) = 0.5
    }

There is clearly some part to this I'm missing... Is there not a DETAILED tutorial on this stuff anywhere??

EDIT 03

I see sort of where I'm going wrong. I added a new script to my "Dead Replacement Alien Zombie":

function Start () { // Use the Glossy shader on the material renderer.material.shader = Shader.Find(" ZombieAlienDissolveMaterial"); }

function Update () { // Dissolve renderer.material.SetFloat( "_SliceAmount", 0.5 + Mathf.Sin(Time.time)*12 ); yield WaitForSeconds(12); Destroy(gameObject);

}

But it STILL is doing Jack!?!

EDIT 04

Ok let's try again... I'm trying this and it's STILL NOT WORKING!!

function Start () { // Use the Glossy shader on the material renderer.material.shader = Shader.Find(" ZombieAlienDissolveMaterial"); }

function Update () { // Dissolve renderer.material.SetFloat( "_SliceAmount", 0.0 + Mathf.Sin(Time.time)*1 );

}

function KillSelf () { yield WaitForSeconds(12); Destroy(gameObject);

}

Like I say is there not a DETAILED tutorial on this anywhere, something step by step!

EDIT 05

I set up a new Zombie Alien Ragdoll prefab and gave it this script:

function Start () { // Use the Glossy shader on the material renderer.material.shader = Shader.Find("ZombieAlienDissolveMaterial"); }

function Update () { // Dissolve renderer.material.SetFloat( "_SliceAmount", 0.9 + Mathf.Sin(Time.time)*1 );

}

The Dissolve shader is attached to the "Body" of my Ragdoll (dead replacement) What hapens when I shoot my Alien Zombie is that his dead replacement shows up Bright Pink and the Dissolve material is NOT working.

I conducted a test where I just dragged into my scene a ragdoll with the Dissolve shader and the above attached script and when I play the game (test) in the inspector I can select my custom Dissolve Shader and it works, it dissolves in and out, I only want it to dissolve out but it also says it's a "Shader Instance??"

How do I fix this so that when I shoot my alien Zombies they're Dead Replacements/ragdolls Dissolve out?