Interesting discussion. Here's my method for what it's worth. I can say that it does work quite well, but have no idea on the weight added bit...
1. Coat a piece of paper with extremely thin rubber cement (thinned to the point that when it dries there is almost no tack left to it).
2. Spread a piece of film onto the paper (the side you applied cement to). Make sure it's spread as smooth as possible. If you've thinned the cement properly, you can easily peel the film loose and reposition if you mess up the first time...or the second...or so on.
3. LIGHTLY mist the film with 3M-77. It only takes the most minute amount.
4. Trim the paper/film patch to size to match the hole, tear, etc.
5. Lay atop the offending area and ensure that the film is attached completely across the bonding surface. I like to lay the patch on the top surface, just to maintain consistency that the bottom of the wing is the surface to watch out for.
6. Carefully peel the paper loose. It should come right off with no resistance.
I've tried this method a number of times, often to address extremely large tears, with great success and minimal frustration/time investment. Biggest advantage is that you don't have to brush/spray adhesive onto the wing, which I find sometimes leads to unpleasant circumstances, at least for me. When the tear is extremely large, you only want to get the 3M-77 on the outer edges of the patch because its weight is definitely not negligible, and it represents a huge sticky surface, which is a storage risk since 77 remains very sticky for a very long time. In theory, the rubber cement does not leave a significant residue on the film provided that it has been given enough time to dry prior to the film being layed on the backing paper.
Good flying,
Joshua Finn
--- In Indoor_Construction_at_yahoogroups.com, "John Kagan" wrote:
>
> --- In Indoor_Construction_at_yahoogroups.com, "mkirda@" wrote:
> >
> > Is there a recommended way to patch OS film?
> >
> > Regards.
> > Mike Kirda
> >
>
> Don't know about "recommended", but I use a procedure modeled after the old microfilm patching method:
>
> - Sandwich a piece of film between two sheets of newspaper
> - Brush some adhesive around the area to be patched (do this before you cut the patch, because it will change the size and shape of the hole/tear)
> - Cut the newspaper/film/newpaper into an appropriately sized patch
> - Remove one piece of newspaper (microfilm used to stick to the remaining piece nicely - plastic film doesn't as well)
> - Stick the patch over the hole/tear. It is easiest to position it properly if you turn the wing over and apply the patch on the opposite side.
> - Remove the remaining piece of newspaper
>
Received on Mon Feb 04 2013 - 09:38:11 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:47 CET