How do you pay for CapEx/Maintenance?

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I've been thinking about using my primary homes' HELOC to pay for capex and maintenance costs on investment properties. Even though it's a variable rate (which is going up slowly these days) it amortizes the cost over 20 years making the out of pocket much less than using industry standards like $200/SFH door. Basically allows me to pocket much more each month I can use to keep investing.

Does anyone have any thoughts on this?  Great idea?  Terrible idea?  

How do you typically pay for capex or maintenance?