I'm seeking the wisdom of the community to help me find a path of sustainability; my project is to recycle a house and not make a mess and pollute, and re-use or make as much stuff as I need: I'm remodeling a 1974 Housing & Urban Development(HUD) "Low-Income Residential Unit R-4" (yes folks, a house the federal government designed & paid local contractors to fabricate =).

My legacy siding is vertically oriented "T-1-11" siding, and I'm curious is there is an admixture that will allow me to seal the siding, as well as perhaps increase durability.

I need something that is weatherproof to exterior specifications, and have pondered using the kind of grout that bathroom tile is set with (diluted a small bit and applied with a fat-nap roller)~

I'm loath to paint the siding and perpetuate the cycle of maintenance & pollution that was started in 1974, but our house is >sagging< and needs some actual protection/repair & cosmetic make-it-look-nice attention.

...any thoughts?