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I am making an extra large outdoor pumpkin prop. I was thinking to use a yoga ball and cover it in paper mache. What would you suggest for the top coat to make it carvable, smooth and weather proof? I saw someone has used Great Stuff for a project like this, but i've heard it never stops expanding so you will get cracks in it. Any suggestions would be greatly appreciated, thank you!

 

[TosaTerror]

Great Stuff will stop expanding when it dries (usually after a few hours). Plus the cracks will give it the imperfections that all pumpkins generally have. What are you looking to do with this prop? Is it just a pumpkin or will it be some sort of creature (pumpkin sentinel)?

 

[Bosco P. Soultrane]

i would attach a rope to the top of the ball and hang it outside.
I would then start at the "stem" and work longitudinally from stem to butt, like a lines in a pumpkin.
Don't make it too thick, it will expand. Get a spray bottle with water and spray it to dry faster.
After drying, carve as needed, Cut rope (leaving a stem), the yoga ball will deflate if you cut a hole in it, you could remove it then or leave it.
Paint.

 

[Zombie4*]

I used plaster wrap, paper mache and great stuff over a beach ball. I used dry loc to weather proof-acrylic paint over it.

 

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Thank you everyone for the tips and ideas on using Great Stuff and water proofing. I will try it out tonight along with the dry loc top coat.

Amazing pumpkin Zombie4*! I love it with the lighting. I can't wait to make mine. I am trying to make a large jack o lantern for my Jack Skellington to sit on.

Thanks again!

 

[Zombie4*]

Thank you everyone for the tips and ideas on using Great Stuff and water proofing. I will try it out tonight along with the dry loc top coat.

Amazing pumpkin Zombie4*! I love it with the lighting. I can't wait to make mine. I am trying to make a large jack o lantern for my Jack Skellington to sit on.

Thanks again!

Thank you! Please post pics as you work..Im excited to see this completed I Love anything with Jack Skellington

 

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Me too, will do!

 

[Jaybo]

https://youtu.be/MSrQGKiFyVA

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