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Trouble Closing a Seal Line Map Case

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I recently got a 12"x16" clear, plastic map case by Seal Line. I can't get the zip-lock-like closure to close. Seal Line suggests applying Vaseline, which I don't want to do because I think the Vaseline will trap dirt and make matters worse. If any of you are familiar with this map case and provide hints on getting it closed, I will appreciate it.
 
Maybe a silicone lubricant would help.

Is the trouble indoor or outside? Those heavy duty zip-locks can be annoying when it's cold.
 
Vaseline does help and I don't think it'll cause too much problem with debris (just use the thinnest application possible, no globs). But I avoid those ziploc-style map cases now.

The newer Recreational Barrelworks one with a waterproof zipper (like on a dry suit) is so much better. Only used it for one season so far but it's no worse for wear so far.
 
I found silicone helped. In the field, so does spit - just lick your finger and run it along the seal.
 
The newer Recreational Barrelworks one with a waterproof zipper (like on a dry suit) is so much better. Only used it for one season so far but it's no worse for wear so far.
Thanks. I’m going to return the Seal Line and order from RB. Zipper rather than zip lock seems sure to work better.
 
Thanks. I’m going to return the Seal Line and order from RB. Zipper rather than zip lock seems sure to work better.

Have a look at Aquapac. I bought one in 2008 and have never wanted to go back to any of other options.

 
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