As I am getting ready to finally start carpeting. I went to my local hardware store that has everything! I always go there for those hard to find things. I never thought about looking for carpet adhesive there. Well as I'm waiting for the salesperson to fill my hardware order I took a stroll around the store and found the original glue I was looking for.
HENRY® 263 WeatherPro™
Outdoor Carpet Adhesive
https://www.wwhenry.com/content.aspx?id=127&View=Product&cID=79&pID=84
Quoted from site:
Waterproof after two hours
Bonds To:
HENRY 263 WeatherPro Outdoor Carpet Adhesive bonds outdoor carpet and artificial turf to concrete, asphalt paving, abraded fiberglass substrates, roughened aluminum boat decks, and exterior- or marine-grade plywood decking
So it's made for what we are doing here!
Just for the hell of it I ran another quick test and it performed awesome!
Roberts and Henry's 663 absorbed water like a sponge after just 3 hours. I only let the Henry's 263 dry about 18 hours then soaked it in water for 14 about hours and it is the same as when it was dry! It repels water and is truly waterproof! Adhesion is great!
Henry's 263 dry time about 18 hours
Henry's 263 after soaking in water for 14 hours
This is what Roberts looked like after just 3 hours soaking in water
So my final decision on adhesive is to use both Henry's 263 and Contact cement. I made the descision out of ease of use and quick adhesion.
I will use Henry's 263 on the surface then lay the carpet roll and let dry for at least 24 hours. Then I use contact cement for the edge wrap. Using both products for the best way they perform.