1. can u explain again the steps more clearly? just to assure all your customers or future customers understand how to apply the product.

Ans : Bro we will provide a guild to you , so just follow the step everything can be done if not understand please kindly drop me a call so I can explain direct to bro I also don hope any mistake from my buyer haha ~
2. as for the coating done. i usually bring my car for car wash every weekend. so will the car wash damage the coating?

Ans : Bro it wont spoil the coating if bro don use soap to wash on the screen. Just use clean water wash it 100% no problem ~ Asid rain also will spoil the coating. The consumption of coating is depend the situation.

3. 1 set of the 'rainaway' can used for how many cars wind shield? ( i got 1 merc, 1 new saga blm and 1 kenari.) can 1 box apply to all 3 cars?

Ans : Normally we suggest 1 pack for 1 screen , But some buyer also using 4 packs for whole car

(front screen : 1 pack , Back screen : 1 pack , 2 side screen : 1 pack (total 2 side need 2 pack)

4. and every application can last at least for 1 year?

Ans : It depend bro how to take care the screen , example my wira 10 years. It always in my home with shelter now I Using it already 1years still no problem. My new Saga BLM using 1.5 years also no problem also in shelter.  So how long can hold also depend situation