I wondered why a lot of the local commercial daycares had that weird green plastic "filler" in their chain link fences.  

Some years back when recycling started, the property changed hands, the new owner assigned 3 pails to each tenant, for regular, paper, and plastic garbage, so each will handle their own.

If you are worried about it, put their stinky paperwork in a plastic bag and hold onto it to show the judge in case they sue.

It's not like being in a patio home development where every house is the same so it truly comes down to the opinion of the appraiser plus the opinion of the buyer.

99.9% sure you can not seal plastic laminate flooring.

I can eat outdoors at a restaurant probably 300 days a year listening to live music on the patio. 

You will have a lot of trouble with them, find a good mason that works fast, I say mason because any wood, metal or plastic fence will be destroyed over night, build a block wall and fill it solid with concrete and rebar.

Moving on to your private patio and maintenance-free yard'...

If the new owners wanted to build a 10k patio on it, the neighbor would have to pay to get it fixed if any future leaks /issues occurred.Being a  sewer line ( vs water line), that may be very different though!

There were no factory workers or pornos or plastic bins involved.