Protect hotmelt adhesive from melting?

Is there a way to protect hotmelt adhesive from melting? I really like the stuff, but unfortunately, the temperature in my car literally made the stuff melt! Can this stuff be protected by gluing cardboard on the outside, kind of like cardboard plating for the glue interior?

The price for 25 lbs is usually around $70 and I was wondering if there is a competitively priced (per/lb) adhesive that works in a similar fashion.

What I like about hot melt:

1. Quick setting
2. Bonds quite well to most substances
3. Cheap
4. Indefinite shelf life

I read about high temp hot melt, but it's expensive and I heard that it's not much more heat resistant.

If going the hot melt route, I was thinking of possibly getting a 10lb case of this:
http://ift.tt/2qzl4SY

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Protect hotmelt adhesive from melting?