Andy J Posted September 15, 2021 Share Posted September 15, 2021 About to cover the rear section (spar to TE) of a Playboy Senior wing with a translucent shrink film from HK which I know does not stick well from past use. Leading edge back to the spar will be covered with a solid colour. Am I better applying the translucent covering all the way from the TE to the LE or wrap the surplus covering around the main spar to ensure a solid surface on which to apply the second forward section solid colour. Wing has a slight under camber so intend to apply the underside covering in one piece all the way to the tip whilst the top covering will be applied in two sections given the wing has a poly dihedral. Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted September 15, 2021 Share Posted September 15, 2021 2 hours ago, Andy Joyce said: with a translucent shrink film from HK which I know does not stick well from past use I've not had any problems with the HK films but I do try to have at least 1cm of overlap on the joins. I'd just take it to the spar, wrapping it around won't do any harm, but I'd take the front film back far enough to get that 1cm overlap. Quote Link to comment Share on other sites More sharing options...
Andy J Posted September 15, 2021 Author Share Posted September 15, 2021 Thanks Bob. Will apply balsalock to the joint overlaps just to be sure it sticks anyway. Unsure if also best to overlap the TE on the underside covering such that the covering wraps around the full 1 inch of the balsa TE top and bottom (if that makes sense). Would not normally do such a large overlap that but as I say it did not stick well on a glider I covered recently. Perhaps I used too heat last time as found that HK solid orange sticks well at 100 deg C. Quote Link to comment Share on other sites More sharing options...
Andy J Posted September 15, 2021 Author Share Posted September 15, 2021 Well messed up straight away as pulled off the backing and the static caught it forcing the glued side together. Not enough now to do the entire wing so will have to re-think what to do now. Re-order or raid my other stock holdings. Quote Link to comment Share on other sites More sharing options...
Andy J Posted September 15, 2021 Author Share Posted September 15, 2021 HK have certainly pushed up the price of shipping from Europe as it cost more than the covering film itself, so felt I needed to order 2 rolls just to make the cost of shipping more tolerable. Quote Link to comment Share on other sites More sharing options...
Nigel R Posted September 15, 2021 Share Posted September 15, 2021 56 minutes ago, Andy Joyce said: Will apply balsalock to the joint overlaps just to be sure it sticks anyway. I think prymol was the stuff that aided film overlaps? it etched the film surface. is also very useful for getting silicon goop to stick to film in wing saddles, for instance. Quote Link to comment Share on other sites More sharing options...
Andy J Posted September 15, 2021 Author Share Posted September 15, 2021 Just done a quick search for Prymol and cant find a supplier. Quote Link to comment Share on other sites More sharing options...
Alan Gorham_ Posted September 15, 2021 Share Posted September 15, 2021 That's because it's been out of production since Solarfilm stopped manufacturing years ago. Quote Link to comment Share on other sites More sharing options...
Andy J Posted September 15, 2021 Author Share Posted September 15, 2021 Is there an alternative product to Prymol? Quote Link to comment Share on other sites More sharing options...
leccyflyer Posted September 15, 2021 Share Posted September 15, 2021 Deluxe Materials Cover Grip - not sure about how transparent it is on fully transparent film though, it's a white liquid when cold. Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted September 15, 2021 Share Posted September 15, 2021 1 hour ago, Andy Joyce said: Unsure if also best to overlap the TE on the underside covering such that the covering wraps around the full 1 inch of the balsa TE top and bottom I wouldn't as it will give a dark outline with translucent films. If you doubt the film's grip on balsa you could paint the balsa tips, spar and t/e with Covergrip or similar. Quote Link to comment Share on other sites More sharing options...
Alan Gorham_ Posted September 15, 2021 Share Posted September 15, 2021 1 hour ago, leccyflyer said: Deluxe Materials Cover Grip - not sure about how transparent it is on fully transparent film though, it's a white liquid when cold. Cover Grip is an equivalent to Balsaloc, not Prymol. Quote Link to comment Share on other sites More sharing options...
leccyflyer Posted September 15, 2021 Share Posted September 15, 2021 1 hour ago, Alan Gorham_ said: Cover Grip is an equivalent to Balsaloc, not Prymol. I didn't say that Cover Grip is an equivalent to Prymol. Andy asked for an alternative product and Cover Grip is an alternative product. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted September 15, 2021 Share Posted September 15, 2021 Prymols not a product that flew off the shelves, try a few shops they may have some. Quote Link to comment Share on other sites More sharing options...
leccyflyer Posted September 15, 2021 Share Posted September 15, 2021 My small tin of Prymol is more than 25 years old - been used maybe four times. A little goes a long way. Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted September 15, 2021 Share Posted September 15, 2021 I'm sure Solarfilm stated somewhere that Prymol was only for original Solarfilm and didn't etch polyester films. I used Balsaloc on dodgy surfaces - gf, ply, plastics and the like. Quote Link to comment Share on other sites More sharing options...
leccyflyer Posted September 16, 2021 Share Posted September 16, 2021 I used Prymol a few months ago to prep my Kyosho Spitfire refurb for painting. It did a good job on what I suspect is probably Solarfilm and the B&Q acrylic has adhered pretty well. I removed a couple of patches of the underwing covering to fit radiator and air cooler and that film had that slightly rubbery cheap plastic texture of Solarfilm. Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted September 16, 2021 Share Posted September 16, 2021 14 hours ago, Nigel R said: I think prymol was the stuff that aided film overlaps? it etched the film surface. is also very useful for getting silicon goop to stick to film in wing saddles, for instance. Dont 14 hours ago, john stones 1 - Moderator said: Prymols not a product that flew off the shelves, try a few shops they may have some. Weston UK have a tin on the shelf when I visited last week. Quote Link to comment Share on other sites More sharing options...
Nigel R Posted September 16, 2021 Share Posted September 16, 2021 1 hour ago, Engine Doctor said: Dont don't use on overlaps? don't use silicon goop? Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted September 16, 2021 Share Posted September 16, 2021 (edited) Please ignore the "Dont " in my previous post I cant explain how it got there as was just mentioning that Weston UK has a tin on the shelf . While i'm back Prymol really only worked with the old solarfilm made from polyprpeleyne . It was very good at making overlaps adhesion stronger and for aiding the adhesion of their paints to the film . It doesn't work with polyester products . Dont know about other plastics . Edited September 16, 2021 by Engine Doctor Quote Link to comment Share on other sites More sharing options...
Andy J Posted September 16, 2021 Author Share Posted September 16, 2021 Is HK film made from polyester? Quote Link to comment Share on other sites More sharing options...
leccyflyer Posted September 16, 2021 Share Posted September 16, 2021 Yes -it's vastly superior to Solarfilm. Cover grip will certainly work on any overlaps, but I'd advise a test to see how it looks with a transparent film. The overlaps will look darker anyway, due to the double film thickness, but if the Cover Grip dries opaque it might spoil the appearance of the covering job completely. Quote Link to comment Share on other sites More sharing options...
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