I'm thinking about spray foaming my garage walls. 35x75 16ft ceiling. 2x6 construction. Already F/G 12 yrs ago. Do alot of truck washing, F/G deteriorating it's R-value. Where would I look at buying a semi professional or residential application system. The walls are metal, not a big deal to remove metal and spray. If this works out will consider doing my house one room to a time. Going to be doing some remolding anyways. Also, if this all works out will do some part time work with equipment to offset the cost. Do not know where to even start looking for equipment.