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Im trying to deside what kind of primer to use on a friends low budget paint job. My choices are below.

1. ppg k36 $152.xx Mix 5:1 I would mix 4:1
2. evercoat durabuild $74.xx mix 1:1
3. evercoat eurofill $73.xx mix 4:1
4. omni 2k surfacer $83.xx mix 5:1 I would mix 4:1
5. omni 1k surfacer $52.xx mix 1:1

Any help on the above would be apreciative. Please describe why you like one over the other. THe price above is what it costs with all the addatives. Any idea why they sell a primer with a quart of addative were you mix 5:1? There is only 4 quarts in a gallon so you won't have enough addative for all your primer.

I've used the first 3 that you listed, but not the last 2 so I can't say anything about them. The 2 Evercoat products work good, but if left for some time on the car get very hard to sand off (my opinion), but they do work good, and smell alot like fiberglass when sprayed. The price of them is good too, but sometimes they have a tendency to react with some of the better top coats.
The K-36 is what I normally use, it is a very good product, sands easy, and fills in heavy scratches very nice, and I've never had a reaction with it. The first time you get a reaction, you'll know why some products cost more than others, and then all the re-work to fix the reaction its not worth using the cheaper stuff. I've never figured out why they went with 5 to one on it though, but then I've never been short when mixing it together either. You can also reduce it by using DT860or 870 (temp dependent) to get a little more flow out and a shorter dry time. I hope this helps.