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Can anyone recommend a basecoat that would seal/weatherproof paper mache and provide a good foundation for acrylic paint?
And once I paint the acrylic over the basecoat, what can I use as a final coat over the acrylic to best weatherproof it?
for a base paint you use gesso..its a white base color..
for a final coat you can use a very strong varnish..
like boat varnish..it will be waterproof but toxicity..so not for food..
You might also consider using as a base coat Exterior Emultion house paint, then use final coats as suggested above by Shablulit.
I make hundreds of "bird Houses" each year using these paints and they have been used outside for years