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If you keep outdoor capret(turf) wet and soapy then it rides. If you have somthing underit instead of the natural ground such as a drop (wood) it will work alot better cuz it will help to keep the water and soap and also provide a flat even surface.
Snowgel from what I hear is like soapy water except u put it on once and it lasts like 3 days of sessioning! just search it uhm
Backyardterrainpark.com helps
as for rails Build a jib 101 is a cult that has some plans
basicly wood and pvp pipe
Pvc pipe = cheap =]