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I am cleaning wooden (pressure treated) deck.
I am new for this process so sorry for silly questions.

I use cleaner and power washer on Thursday morning to clear top sides of all boards. I plan to put waterproofer this Saturday.
Any particular recommendation of waterproofer?
Can I use spray gun to put it on? Should I put waterproofer on the top and sides? Should I put it on the bottom of the boards as well?

There is PM showers expected tomorrow. Should I cover deck with the tarp to protect new waterproofer from rain. I know it sounds desperate, but I really straggled to find five rein-less days this summer.

I rented the 2000PSI gas powered power washer from HomeDepot for $55/4 hours. I do not want to go though this rental drill again. Should I buy a cheap electric powerwasher (i.e. 1600PSI) for the future work like this?

thanks