Thread: Help with Alternitives to monster mud

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I am working on building a witches house this year and I need a weatherproof alternative to monster mud. I remember reading about this somewhere before but can't seem to find anything on this forum. (i found one for using resin but that won't work for my needs)

Basically I have sheets of plywood that I have glued chunks of Styrofoam to and I need to make the grout for between the stones next. I have done something similar in the past with monster mud and it worked great. pic but this isn't going to be in a covered area so it needs to be able to resist rain for at least a month. Any help would be appreciated.

Bondo. I use it as much as latex for various projects. It sets by chemical reaction but doesn't heat too much to melt styrofoam. Bit messy though but the fumes are entertaining. LOL

I would still use MM and paint it with an exterior paint. My stuff stays out well over a month with no issues.