use only small amounts.
ps: i started out with TW hard shell, and i STILL have at least have half a can haven't finish

planning to detail my iswara as i haven't washed it for more than half a year

Yes. Totally forgot about this. I'm using A LOT of wax during waxing. Lesson learned..
8 year old car that hasn't been polished...clear coat should still be there. It won't wear out over time, but it *could* deteriorate (oxidize, peel, etc.) to the point where the only way you can get it shiny again is to repaint. I'm quite confident, under normal conditions (not exposed to extremely harsh environment or treatment), you'd still be able to 'restore' the paint to better conditions.
Now, to the steps.
- wash - right
- clay - still on track
- wash - depends...if you're using some sort of quick detailer for clay lube you might not need to wash again. A simple wipe down again with the same quick detailer could do the job. But if you're using shampoo mix as clay lube, then you'd need to wash the car down again.
- Ultimate compound using RB - still on track but with what pad? And errr....I hope you know what you're doing. If use with a compounding pad (or wool pad), it would be a very aggressive combination and you'd bee cutting a lot of the clear coat. Just be careful and check/inspect regularly.
Thanks for reminding me on the pad. I was unaware on this. Was thinking that to compound > need to use compounding pad..So far you have the right idea there. But after compounding with UC there would most probably be compounding marks as UC//RB is quite an aggressive combo. You should carefully inspect for compounding marks, buffer trails, holograms (google them, plenty of pictures/illustrations on how they look like) and if you see them, the next step is to 'step down' to a less aggressive combo (change to a milder polish like Ultimate Polish with a less aggresive pad like a polishing/finishing pad) to remove those.
Afterwards, you'd most probably would need to wash the car again to remove all the polishing dust, then only you do a wipe-down with IPA or the like. Thoroughly inspect the car again for anything that you missed or any area you missed out. If all are in order, next step is to apply the coating.
Will washing the car after polishing will create mar on the paint? Noted on the IPA step
I haven't use Carlack68 products before. But, from their descriptions, SC is an AIO and LLS is a sealant. If you want to use the SC it should be after using a finishing polish and BEFORE applying the coating, but you'd still need to do a thorough wipe-down to remove the protection that it left behind. Personally, I think it's a little redundant. And LLS should go after the coating.
I'm quite confused on this. From my understanding coating suppose to protect the paint thus if i coat after using wax it will flush out together with wax within certain time just like what other wax does. Correct me if i'm wrong on this.
Depending on what type of coating you plan to use, you might or might not need to put on the LLS on. For this, you'd need to check with the seller or anybody else who have experience with Permanon or Opti Coat whether it's safe or not to put on a sealant on top. Personally, if SC could effect a coating, I don't think that coating is even worth getting...
Am planning to have a repellant effect + glossy paint on her car. Will check further on the coating thingy with the seller. Thanks a lot KrisMas for your clarification.