There have been some really good replies, but something is missing in most. When you use bonding adhesive on EPDM, it is used as a contact cement. You don’t get to smear it on and then put the EPDM directly into it. If you read the manufacturer’s installation instructions, the intent is clearly to apply it to both sides, and use it as a contact cement.
In the real world, this makes EPDM difficult for many DIY installations. It seems easy, but if you miss some of the minor details, you can wind up with an expensive pile of junk on your roof. Rolling bonding adhesive to the deck and then rolling the EPDM over it is one of those ways.
When we install EPDM, there is a “push test” (manufacturer’s spec) that requires the bonding adhesive (applied to the deck and the folded back roll) has flashed off before coming into contact with the other surface. You push, and it should NOT be liquid.
The problem is that when you have an awkward, flexible material covered with adhesive that bonds on contact to the deck, the process of getting it rolled into position is a bit arduous. It is also the reason that many newbie roofers and contractors ignore the “let both sides flash off before they come in contact” restriction. That is, they have not been in business long enough to see how applying “dry” EPDM over a rolled coat of bonding adhesive can come back to bite you in a year or two or three.
If you want to tackle it, it takes at least two people. Position the EPDM, fold it back the long way about half the distance, apply bonding adhesive to the underside of the EPDM (now on top) and the deck, and allow to flash off. Use a push broom or similar and push the center of the sheet into the adhesive. Then move first one direction, then the other, pushing the EPDM into the adhesive a bit at a time, while your helper holds the sheet up enough, and tightly enough, to keep it from contacting the deck surface prematurely--meaning before it has been broomed carefully into place.
There is a much easier solution. Put down a 1/2” rigid insulation board first, secured with 3” metal discs and screws, then use water-based adhesive (Mule-Hide). Use the same process, except that you can broom the ("dry") EPDM directly into the wet adhesive. That one detail will take almost all the hassle out of DIY EPDM.
One other tip: For an area that small, go with a heavier, reinforced EPDM. Just ask for “60 mil reinforced.” The few extra dolalrs you spend for the better material may well be the best investment you ever make.
Good Luck!
EPDMSpecialist
http://www.EPDMSpecialists.com