When the standard H-wire stake is just not enough, here's a heavy duty wire stake option for your coroplast signs. Use this one for a more long term application.
This heavy duty wire stake holds up very well in most weather conditions, but take caution when the soil is hard or trying to use a rocky location as undue force can bend the frame. In hard soil conditions it's best to pour some water where you want to stake the stakes, makes driving into the ground a snap!
It's ALWAYS a good idea to keep a small supply of extras on hand so don't short change yourself!