well the first time i got it i just used liquid nails, and that fell off in like wekk, and the i used screws and it held good, but in the spring it started to bubble, so u can use just screws, but them like every 1 to 2 feet
HAHA everything has a freezing and melting point. If you were to place some HDPE in liquid nitrogen (-100 degrees or something) and then hit the HDPE lightly with a hammer....the thing would shatter in like a million pieces...almost as if you had shattered glass. I did it once with a plastic garden pipe...twas so cool.
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yes. it does. it's not directly harder, per say, but it does work better. The cold causes the particles to form stronger and more denser bonds - allowing for a seemingly harder piece of hdpe that slides better. A good example of this is cheese. If you leave cheese out on the counter (before it gets all moldy), it's relatively soft. It is still a solid though, and it still holds it's brick form, however, if you were to try and cut it, it would be easy. Now, stick that brick of cheese in the freezer for 2 days, and then take it out. It's still a solid, and it's still in it's original brick shape, but you'll have a much harder time cutting it with that knife. It's exactly the same.
And to reply to the post with the liquid nitrogen, that's because it is in extreme colds. Everything has a point of the extreme. The reason it does this is because it is instantly changed from normal temperature to an extreme low, and it doesn't adjust properly. It's the same reason you don't take a hot pan off the grill, and immediately set it into the cold water of the sink to clean it - it ruins the pan. Or same reason if you take a turkey out of the freezer, you let it thaw for a long time before you start cooking it - so that it can gradually get to the proper temperature rather than instantly.
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The countersink bit will work on HDPE. First drill pilot holes (tiny holes that the countersink bit will be able to start in) with a normal tiny drill bit. Then take your countersink bit and slowly drill. Countersink it enough that the screw is completely below your sliding surface, but do not countersink too much. My dad countersunk my HDPE screws because he's a perfectionist, but I helped hold the rail/boxes in place.