sun light question

To quickly summarize, I'm replacing a plastic bubble window with a skylight window on a sun room roof with a rubber liner.
(liner might not be the correct term but instead of shingles it is all rubber)
I removed the window and the wooden curb it sat on while keeping the rubber that wrapped the curb somewhat intact. This allows the skylight window to sit flush over the existing hole. The rubber was peeled off the existing curb and is still attached to the rest of the rubber roof, it now hangs
I'm thinking that to properly install the light I should lay down some roof cement about 3 inches wide, 1/4 inch thick around the entire window hole UNDER the rubber , just peel back the rubber and place something to hold it.Then place the skylight window on the hole and the flashing sits on top of the cement. When the window is properly adjusted screw it to the roof, place more cement over the entire flashing and screws, lay the rubber over the cement and trim it so that it sits nice an flat against the roof cement / window flashing. Finally a little more cement over the rubber where the seams are and the edge where the rubber meets the flashing.
I think that'll do it. Does that sounds correct? It is similiar to the actual directions for the window but those are explaining from a shingled roof point of view.
Now as far as the cement is concerned, I have a gallon of Henry 208 wet patch roof cement. I have this from another project I was working on and I'd like to know if that is ok to use for this project. I've seen in the hardware store others that read 'Plastic roof cement' and I wasn't sure if I should be using that instead? What is the plastic part of it ? is it made from plastic?
Thanks for reading and any advice you have.
Best Regards
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Don't take this the wrong way, but on this job, if you have to ask, I suggest you get a pro to install it. No one here can see exactly what you have or the condition it's in. And this is one of those things where if it's done right, it will be good to go for a very long time. Done wrong, it will be nothing but trouble, usually at the worst time.
D wrote:

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ok so you don't know the difference between plastic roof cement and Henry Wet Patch roof cement then?

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