I am a homeowner who likes to garden/landscape my 3/4 acre property. I have just powerwashed and re-pointed (portland cement) a 900 sq. ft. flagstone patio, it is 40 years old and has been built on a sand bed-no concrete pad-it has cracked and moved throughout. It now looks brand new and I am wondering if you pros have any input good/bad about sealing the freshly powerwashed flagstone. What product and process do you rec'd. Do you have to re-apply each year and how do you do that? Thank-you and have a great day. PS-I can not believe how much dirt was removed with the powerwash!