To solve the problem with bubbling during trimming, I use Orastik. Hanger-9 Ultracote is the
cheapest stuff from Oracover line. I use Oracover Scale as a base color and Orastik for trimming.
My techniques:
1, Using paint reducer, take grease and fingerprints off from the base.
2. Slowly apply Orastik
3. Using paint reducer, take fingerprints off from the trim (if not – bubbles)
4. Using an iron (mine is Hangar-9) on position 1, iron the edges of your trim
5. Using the iron on position 1.5, stick all the trim to base. Repeat this adding more heat - Iron position is 2
6. Using the iron on position 2.5, iron the edges of the trim one more time
You cannot put Oracover (Ultracote) on Ultracote. The film was designed to apply on plywood and balsa surfaces only. Trust me. All ARF company which use Oracover (Ultracote) – Hangar-9, SebArt, QQ, Aeroworks and so on, buy Orastik for trimming. Chinese companies use their own film, similar to Orastik, but it’s not as good as German product.
If you want to cover your plane nicely, buy Orastik and do not use Oracover (Ultracote) for trimming.
That’s it.
Just go
http://www.lindinger.at/index.php?language=en and buy a good quality German film, and forget about bubbles