@Andrew Votsis Encapsulation paint is only permitted to be used on certain surfaces that contain lead paint in a home (A couple examples are window sills or handrails). 

I'm not following the 30/50/50 thing, so what I'll do is quickly walk through how a partnership like this usually will work (however, there are many ways to . . . skin a cat, grease a pig, etc)- Two partners take down a property. 

Maybe you just become numb to a-holes looking down on you, and then you realize-- they are a-holes.If you're doing C/D rentals, your skin should already be super thick because of the BS you have dealt with,  and others opinions shouldn't bother you, if it does-- you need thicker skin. 

However, in a plan to further boost my personal credit score and to put more "skin in the game," I am looking to utilize my own stellar credit to purchase materials and appliances for future projects.

I’ve read any hard surface should be water resistance for reasons I’m sure you can imagine.

Thick skin goes a long way in this business,  I've learned the hard way.  

As Long as both sides have skin in the game that should work out OK.

The new law changes are Sacramento’s tardy response to this increasingly growing problem and will only touch the surface of it.To answer the original poster’s question, as of Jan 1, 2020, no city in CA can legally stop you from building an ADU on your single family zoned lot.

You have more options for loans in the 135k loan range, better terms and rates and you won't have that much more skin in the game. 

Step 4: Get a surface level understanding of the various niches of REI.