Most welcomed man!:)
I just use whatever sponge I can find, although if you could, go for one that is made by a known manufacturer. I'm guessing whether it's a name brand or an OEM/china made sponge they are pretty much the same, but some minor aspects like surface roughness might be different or more well refined in a name brand product.
Meguiars sponge is overpriced for what it is. I got a pair of turtle wax one which costs 1/4 that amount and has 2 pieces in it. For my whole car I only used 1 sponge. The Meguiars might have some benefit, but it's quite out of my budget as well for a sponge.
So I just try to strike a balance, i.e didn't go for the cheapest for the risk it may (not saying it will) introduce things like swirl marks etc. The turtle wax one seemed to fit the bill.
Here's what I did when applying my sealant, but this is not the proper process (kinda like a short cut since i'm not really into detailing but paint protection):
1) Wash the car. I used Turtle wax platinum wash (for budget reasons). Just give it a good once over, remove any dirt marks etc.
2) Dry it and dry it well. Make sure no water spots left behind
3) Apply sealant and let it dry. Whether to remove it one panel at a time, or apply to the whole car first, depends on your preference, although some cases, applying it and removing the sealant one panel at a time may have better effects/result. But it's subjective from what I read (and very time consuming)
If you've got some minor scratches, you can try to polish it away or use a product like ScratchX 2.0 to get rid of it. I got some markings, but I did not bother to remove it. For tougher marks and stains, you may need to clay it, but that's something I've not done yet. Once I do i'll probably share it here

Once the sealant is applied, the compound in the sealant will bond with the paint to help protect the paint. I am not sure if it literally adds an invisible layer on top of the paint to the point of sealing it completely. But if you've got some stains/scratches, it would potentially help prevent the underlying paint from being further damaged when exposed to wind, acid rain etc. (but I could be wrong on this, so if anyone's got inputs, do feel free to correct me)
Hope this helps

One final note is that different types of washes have different properties. Meguiars NXT wash from what I read tends to have slightly stronger cleaning properties and strips off just slightly more wax or sealant as compared to their gold class wash. So after this round, I might use their gold class wash instead.
QUOTE(mango27 @ Apr 10 2014, 03:46 AM)
thanks
perror... i guess i'll go for mirror glaze then...
just a couple more questions... do you use the meguiar sponge when applying the mirror glaze? i find it rather expensive for the sponge... bout 45 bucks per piece...
also, what product of car wash you use before applying mirror glaze? i have some tough stain and minor scratches at the front bumper... since mirror glaze is a sort of sealant, wouldnt it seal the stain/scratches underneath the layer?
This post has been edited by perror: Apr 10 2014, 01:17 PM