Safe for plastics? I want to store gun magazines with plastic baseplates.

Hi, thank you for your question! It's absolutely safe for any kind of plastic. Be sure to clean those magazines inside and out for best results! Have a great day!

Can you use a food saver to vacuum seal these?

Thanks for your question. These bags have a reclosable zip-seal on them. You don't need any equipment to seal them. Vaccum is not required for VCI protection to work.

Can these be used in underground stash boxes for long amounts of time???

They have a stated lifespan. For their life they are good. But if you want true long term, you are looking for hermetically sealed, with dry nitrogen gas.

ASIN	B08RP6L12S
Brand	Cortec
Brand Name	Cortec
Colour	Blue,Transparent
Item Dimensions L x W	30.5L x 25.4W Centimeters
Item Type Name	Poly Bags
Manufacturer	Cortec Corporation
Manufacturer Part Number	20800111
Material	Polyethylene
Material Type	Polyethylene
Model Number	VpCI-126
Net Quantity	10.0 Count
Number of Items	1
Product Dimensions	30.5L x 25.4W Centimeters
Unit Count	10.0 Count

VCI Anti Rust Zip Close Bags (10x12 inches - 4 mil) Cortec VpCI-126 Rust Prevention Top Seal VCI Poly Bags for Metal Protection (Pack of 10 bags)

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