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Laminating

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Tony Hobson10/01/2019 18:26:01
14 forum posts

Hi Everyone,

Can anyone help ? I need to laminate 1.5mm ply sheet onto 3mm balsa to form part of the fuselage of my Fieseler Storch. What would be the best adhesive to use to avoid warping. Thanks in advance for any suggestions

Cheers

Tony Hobson

Don Fry10/01/2019 18:40:56
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3451 forum posts
40 photos

Is the laminate flat, or is one of the components already built in.

Denis Watkins10/01/2019 18:41:23
3597 forum posts
166 photos

The heavy press is the important thing Tony, with As any chosen glue can cause warping

Rub down lightly the surfaces to be bonded as ply has releaser in the surface from manufacture which is not good for bonding

Get everything ready in advance

Then e.g.Aliphatic spread evenly with a credit card, enough to wet the surfaces thinly then PRESS

Press with flat boards and weights on a flat surface and leave a day if you can

Edited By Denis Watkins on 10/01/2019 19:11:34

John Stainforth10/01/2019 18:51:37
289 forum posts
38 photos

I would use aliphatic. Epoxy would be overkill and CA might not work on the ply at all.

Don Fry10/01/2019 19:09:52
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3451 forum posts
40 photos

The trouble with water based glue is I that it takes more than a day to dry if there is any area involved. Traditionally a contact adhesive is used.

Engine Doctor10/01/2019 19:53:57
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2205 forum posts
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Whatever glue you decide to use make sure that you sand the ply to remove any release agent used in its manufacture . Often forgoten is balsa cement . Its strong and reasonably quick for laminating . As Don says contact adhesive is the most commonly used .

Peter Miller10/01/2019 20:46:06
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9846 forum posts
1157 photos
10 articles

When laminating ply to balsa I use Evostick. Not the water based muck but the original stuff.

BackinBlack10/01/2019 21:13:37
87 forum posts
1 photos

I use a method that was described in an early 80s issue of Radio Modeller which has proven to make strong and reliable laminated sections ever since.

The joint surfaces of the parts to be laminated are brushed with a thin coat 70/30 PVA/water mix and allowed to dry thoroughly. When dry bring the parts together in their final position and apply a domestic iron preheated to "cotton heat" for a minute or so. As the PVA is heat sensitive it will form an excellent bond and the iron being flat will hold the lamination flat.

I have some models that have used this laminating method for fuselage formers that date from the 80s which are still structurally sound. I have even used this method with thin ply sheet place of fibreglass bandages for wing joining, far neater and stronger.

Former Member10/01/2019 22:17:34
724 forum posts

[This posting has been removed]

onetenor11/01/2019 02:14:18
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1890 forum posts

Wipe the ply with a solvent ( meths acetone etc) and allow to dry. /////////Then sand off. This ensures removal off the release agent completely

VERY USEFUL STUFF METHS

Piers Bowlan11/01/2019 17:27:14
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1754 forum posts
42 photos

You could try Thixofix contact adhesive, Casamite powered resin glue or Tightbond 2 (or Tightbond 3). These are very strong and waterproof when dry. Casamite is used in boatbuilding. Personally I wouldn't use PVA for laminating as it needs air to dry.

Edited By Piers Bowlan on 11/01/2019 17:31:10

Peter Miller11/01/2019 18:14:17
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9846 forum posts
1157 photos
10 articles

Aliphatic Resin works really well with the heatthechnique but you have to make sure that the heat gets right through.

A normal covering iron is not hot enough. I used to use a small travelling iron.

Thixofix used to bew brilliant but I haven't been able to find it for some time now

Bob Cotsford11/01/2019 19:32:39
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7788 forum posts
432 photos

Wickes still sell a solvent based contact adhesive under their own label. I tried the PVA and hot iron and while it worked to attach the worktop edging when I tried it on ply doublers everything warped as it cooled. I'll stick with contact adhesives in future.

Piers Bowlan11/01/2019 20:45:33
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1754 forum posts
42 photos
Posted by Peter Miller on 11/01/2019 18:14:17:

Aliphatic Resin works really well with the heatthechnique but you have to make sure that the heat gets right through.

A normal covering iron is not hot enough. I used to use a small travelling iron.

Thixofix used to bew brilliant but I haven't been able to find it for some time now

Thixofix is available via Amazon and eBay, I haven't seen it in hardware shops for a while but the vapours are hazardous so maybe that is why and also why Evo-stick changed its formulation?

 

Edited By Piers Bowlan on 11/01/2019 20:49:35

Tony Hobson13/01/2019 13:01:50
14 forum posts

Many thanks to all who replied offering advice.

Thanks, Dennis, so that's why I experienced some delaminating, I didn't know about the releasant on ply. I'm going to try 'Titebond Extend Wood Glue' - after lightly sanding the ply - see if that's successful.

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