Bicycle Mechanics - Re-Glueing a tubular?

Ok so I am not sure I did a good enough job gluing up my rear tubular...can I simply pull it off and re-glue?

yes.

but dont scrape off any gllue. just reapply a new layer and put the tire back on

Ok so I am not sure I did a good enough job gluing up my rear tubular...can I simply pull it off and re-glue?
That's the test to see if you can. If you can SIMPLY pull it off, you did not do a good enough job. Going slightly against the words above, make sure the glue isn't too thick (it will be obvious if it is)

To test it, put about 20 PSI in the tire. Face the side of the wheel and with both hands next to each other, hook your thumbs under the rim (between the spokes), grasp the tire and rotate your hands forward, gripping the tire as hard as you can and try to "roll" it off the rim. Try it in a couple of places. If it stays stuck, you are ok.

I've run into a bit of a problem with my tubulars. The tires are glued to a Bontrager Carbon Aeolus 5.5. I followed the instructions here:
http://www.cyclingnews.com/tech/fix/?id=tubular

They were fine for a few weeks, but I tested them recently and was able to peel the tire off fairly easily. I want to re-glue the tire but want to do it properly.

The original glue job had 4 layers of Mastik one (3 on the rim and 1on the tire, as the guide states). When I peeled the tire off, it seems most of the glue stuck to the tire and not so much to the rim.

1. Why is that?

Previously, someone mentioned that it would be obvious if there was too much glue.

2. How do I know if there was too much glue?
3. If I am going to re-glue the old tire, do I have to remove the glue from the base-tape of the tire? That would be very difficult.
4. Why was it so easy to pull the tire off?!!
5. Is it recommended to scuff the rim?

I did my first glue job some days ago. When I rode I noticed some ticking sound in my rear wheel. I took it inside for an inspection. I released the air and found out that there is a little gap to the side of the valve. A small hole where the tire don't stick to the rim. What to do?

What I think happened is that I didn't stretch the tire good enough out to the sides from the valve when I put the valve down with wet glue (If you know what I mean?).

Can I just squeeze some glue (mastik one) in and let it harden for 24 hours? Inflate it with much pressure? Or little? Have some weight on it over some time?

Here is a picture:

http://img844.imageshack.us/img844/8730/img8328h.jpg

Edit: Tires Vittoria Corsa CX Evo
Rims 50mm Carbon tubulars

You likely didn't get enough glue on the edge of the rim. You could just reglue that area, but there could be other weak spots just waiting to cause a problem. It would probably be better to remove the tire and reglue the whole tire. Tubulars roll off at the worst possible time -- 25 miles an hour in a sharp turn.

Thanks for the advise. I will try to just glue up that area. Let it harden for some days. Light ride. Then re-inspect :)