Thank you for the question. Painting is possible when fully cured with a latex base paint. Paint adhesion to the adhesive is not guaranteed in an outdoor exposure.
I would not recommend this for that purpose. I doubt highly that it will hold.
Lowe's, but you have to order it on line.Pick it up in the store. No delivery charge.
Buying the 6 tube package from Home Depot is much cheaper than buying 4 individual tubes any where else.
Yes, weather does not affect it.
The Heat resistance for the Loctite Stik 'n Seal Outdoor Adhesive is 110°F.