Furniture, Wood and Cabinetry Finishing - Minwax Polycrylic

After reading other various posts in these forums I have a couple of questions.

First let me say I have a bookcase I painted with a Valspar latex Black Satin finish. I'm not home to look at the can but I am 99% sure this is the type (which is water based I assume so since it said to thin with water on the can). http://www.lowes.com/lowes/lkn?action=productDetail&productId=72476-4-72476-EA&lpage=none

I used this sprayer to paint it. (If I had a better sprayer I would use it)
http://www.blackanddecker.com/ProductGuide/Product-Details.aspx?ProductID=20476

Long story short I would like to put a clear finish over this as it seems to have a little tackiness to it even though I painted it 5 days ago. I would like to spray it on.

I was thinking of using Minwax Polycrylic. Which leads me to a few questions.

1) Has anyone sprayed Minwax Polycrylic with this type of sprayer I have?
2) I think the paint I have on it and the Minwax Polycrylic are both water based so there shouldn't be a problem there right?
3) Do I need to sand the bookcase paint at all before I spray it?
4) Do I need to let the paint cure a little longer before I spray it with Minwax Polycrylic?
5) Any other suggestions in lieu of Minwax Polycrylic that is sprayable? That is all I could find at either Lowes or Homedepot.

I've never used that sprayer but if it sprayed the latex enamel ok, it should spray polycrylic. You may need to turn the pressure down a little or not spray it on as thick.

Latex enamels can take a week or so to cure and some of the cheaper latex enamels never dry to a hard durable film. it would have been better t use an oil base enamel. It dries harder and wears better than latex. You could sand down the latex and apply oil enamel over it.

I don't know how much benifit you will get from polycrylic over your enamel. I wouldn't sand, as the sanding scratches may show thru the water based poly.

I don't know how much benifit you will get from polycrylic over your enamel. I wouldn't sand, as the sanding scratches may show thru the water based poly.

What I am concerned about is that I have read that the paint can have a tackiness to it and that the Minwax polycrylic would solve that problem.

Do you or anyone else know if that is true or to what extent it is true?

I very seldom use any water based poly. It doesn't dry as hard or wear as well as oil base poly. Polycrylic may give you a harder film but I can't say for sure. I've never been fond of applying poly over enamel.

You could sand down the latex and apply oil enamel over it.

If I choose to sand it down and then use an oil enamel. How far down is down. Do I have to completely strip it off to bare wood or are we talking about roughing up the surface and then painting over it?

A light scuff sanding should be sufficent. Don't forget to remove the sanding dust.