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Mad Monster Maker
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Since monster mud is a combination of latex paint and spackling compound, my guess is that, by itself, it's probably vulnerable to damage from rainfall. That being said, if you add a coat of exterior paint or Drylok, your prop should stand up to the rain fairly well.
 

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I mix my mud about 4 to 1 with exterior latex. After it dries, I coat it with Drylok and even with the rain and snow we get in October, it seems to hold up fine.
 

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Monster mud by itself is not rain proof. Like everyone has pointed out you will need to paint it or seal it some how. If it left out in the rain it will get soft and will be ruined.
 
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The Big Kahuna of Fright
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moosecat, a head's up on that Fit-It-All; it's easy to sculpt, but really tough to sand. I've never had problems with cracking during the drying process, and yeah, it dries FAST. So if you leave a blemish, it's gonna stay there...
 

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Super Moderator
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Forget Monster Mud using Drywall Filler! That's for wimps!

Use a cement based patching compound called Fix-It-All. Hard, durable, cheap, totally water resistant. You'll never look back...
How do you cope with the 30 minute set time? When I'm mudding it's usually a lot longer than 30 minutes at a session.
 

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The Big Kahuna of Fright
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Ox - Smaller batches. But, you're right, it will set up as you're working.
 

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The Big Kahuna of Fright
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I once did a seven foot King Tut sarcophagus and I think we used two bags. That was over an armature of chicken wire. With gold paint, man, did it look authentic!
 

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Never try to eat a zombie
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I use a masonary sealer, after I paint it. Mine have lasted in storms, snow, w/o any problems.
 

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Wolfman - sorry, I'm a bit confused, are you using Fix-It-All straight up or are you using in a mud mix instead of joint compound?
 

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Insert Witty Comment Here
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I did the monster mud, drylok, exterior latex thing on my horse and it's been outside for two years..not two Halloweens....two years of being exposed to all the elements
 

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The Big Kahuna of Fright
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I used Fix it All straight out of the bag over an armature of small mesh chicken wire and hardware cloth. But in retrospect, burlap over the armature would really have cut down on the volume and weight. Plus, with burlap, you could increase the water content to get better penetration and slow the rapid setup time somewhat. You don't want to add too much water - you'll get shrinkage cracking.
 

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I'm resurrecting this thread to ask another MM question...

Can you store a batch of MM and if so for how long? When I've used it, I've only made a batch to use at the time so I've never tried to store some but am curious if a large batch could be whipped up and stored.
 
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