I had a portion of my balcony repaired by my HOA and I'm responsible for getting is sealed. The contractor wanted $600 for seal this small portion or $1200 to reseal the entire balcony. Not having the money it looked liked a simple DIY. I was quite overwhelmed with the types of water sealant on the market and I figured I'd ask so I get the correct one. Can someone recommend the correct sealant to get. Its less than 10 sq ft so I'm assuming a couple gallons?