Suitable adhesives - UK Vintage Radio Repair and Restoration Discussion Forum

Hybrid tellies · 24th May 2018, 11:35 am

I am currently tackling three repair jobs, Binatone Mustang, Internet 10 and something calling itself a Shira HiFi, all cheap and cheerful Hong Kong specials dating from the late 1960's to very early 1970's. They have all been got at with RF and IF alignment well out and the speaker on one needs replacing.

I am just after some advice as the best type of glue to use for mounting the loudspeaker to the plastic cabinet. I guess it would be a softer type of glue rather than a hardish glue such as super glue.

For resealing the IF coils is melted candle wax the best or is there a suitable alternative.

On the Shira HiFi portable the aerial coils on the ferrit have been tampered with then stuck down with a waxy substance that I am going to have to remove. Again is melted candle wax the best to resecure the aerial coils to the ferrit rod or is there something more suitable.

I am very cautious with anything concerning glues as I have not had the best experience with any adhesives

.

I apologise if this is in the wrong thread.

Ambientnoise · 24th May 2018, 11:51 am

If you need something to "weld" the plastic case (to repair mounting lugs for example), use Plastic Weld or try polystyrene cement. Otherwise, if you need to actually bond the rim or face of the speaker to the case, I suggest contact adhesive such as evostik. Should be strong enough with a reasonable surface area. Clean and roughen the mating surfaces.

Ken

paulsherwin · 24th May 2018, 11:55 am

Agreed, contact adhesive of the Bostik/Evo-stik type is your best bet. It makes a reasonably strong gap filling bond which can be broken if necessary.

Some of these early 70s HK multiband sets can be surprisingly good performers, though I've found they can be difficult to dismantle.

cheerfulcharlie · 24th May 2018, 12:46 pm

New kid on the block is Sugru if you want something with a bit of flex

https://sugru.com/

Tractionist · 24th May 2018, 1:23 pm

I've found that a hot glue gun is usually quite sufficient for mounting speakers to plastic sub-striates .... it doesn't melt the plastic, and is removable with careful use of a craft knife.

Paraffin [candle] wax doesn't conduct ..... but a far more pleasant [and original] alternative is bees wax ..............

emeritus · 24th May 2018, 2:10 pm

Some 50 years ago I used some of the Evostik dad had left over from sticking some Formica to reglue the spine of a paperback, and it is still secure and flexible. I just hope they don't go changing the formula.

Bazz4CQJ · 24th May 2018, 3:43 pm

I just recently bought a 250ml tin of Evostik and I have been wondering whether it is as good as it used to be. If I needed some more, I think I'd spend some time on Google to see if there are any other strong contenders for an effective contact adhesive.

B

Hybrid tellies · 24th May 2018, 4:00 pm

Thanks for your suggestions. Some of the remaining glue holding the speaker feels more like rubber than normal glue which is what you need for holding a speaker in place.
So I will go with Evostick or Sugru and for resealing the IF coils and for securing the ferrit rod aerial coils I will buy some beeswax.

Many thanks

Refugee · 24th May 2018, 6:44 pm

I once bought a tin of Thixofix.
It was like Evostick gel. It had better filling ability as it did not run.

paulsherwin · 24th May 2018, 7:46 pm

I've found nail varnish to be good for locking cores and trimmers, but I usually leave cores unlocked as they're very unlikely to unscrew of their own accord.

I lock ferrite rod coils with a bit of cardboard.

Refugee · 25th May 2018, 12:39 am

Ferrite rods usually have the coils fixed with soft wax in my experience.

24th May 2018, 11:35 am	#1
Hybrid tellies Nonode Join Date: Jan 2004 Location: 1966-1976 Coverack in Cornwall and Helston Cornwall. 1976-present Bristol/Bath area. Posts: 2,967	Suitable adhesives I am currently tackling three repair jobs, Binatone Mustang, Internet 10 and something calling itself a Shira HiFi, all cheap and cheerful Hong Kong specials dating from the late 1960's to very early 1970's. They have all been got at with RF and IF alignment well out and the speaker on one needs replacing. I am just after some advice as the best type of glue to use for mounting the loudspeaker to the plastic cabinet. I guess it would be a softer type of glue rather than a hardish glue such as super glue. For resealing the IF coils is melted candle wax the best or is there a suitable alternative. On the Shira HiFi portable the aerial coils on the ferrit have been tampered with then stuck down with a waxy substance that I am going to have to remove. Again is melted candle wax the best to resecure the aerial coils to the ferrit rod or is there something more suitable. I am very cautious with anything concerning glues as I have not had the best experience with any adhesives. I apologise if this is in the wrong thread. __________________ Simon BVWS member

24th May 2018, 11:51 am	#2
Ambientnoise Heptode Join Date: Feb 2006 Location: Marlborough, Wiltshire, UK. Posts: 917	Re: Suitable adhesives If you need something to "weld" the plastic case (to repair mounting lugs for example), use Plastic Weld or try polystyrene cement. Otherwise, if you need to actually bond the rim or face of the speaker to the case, I suggest contact adhesive such as evostik. Should be strong enough with a reasonable surface area. Clean and roughen the mating surfaces. Ken

24th May 2018, 11:55 am	#3
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,959	Re: Suitable adhesives Agreed, contact adhesive of the Bostik/Evo-stik type is your best bet. It makes a reasonably strong gap filling bond which can be broken if necessary. Some of these early 70s HK multiband sets can be surprisingly good performers, though I've found they can be difficult to dismantle.

24th May 2018, 12:46 pm	#4
cheerfulcharlie Heptode Join Date: May 2009 Location: Birmingham, West Midlands, UK. Posts: 708	Re: Suitable adhesives New kid on the block is Sugru if you want something with a bit of flex https://sugru.com/

24th May 2018, 1:23 pm	#5
Tractionist Heptode Join Date: Apr 2016 Location: Cheltenham, Gloucestershire, UK. Posts: 875	Re: Suitable adhesives I've found that a hot glue gun is usually quite sufficient for mounting speakers to plastic sub-striates .... it doesn't melt the plastic, and is removable with careful use of a craft knife. Paraffin [candle] wax doesn't conduct ..... but a far more pleasant [and original] alternative is bees wax .............. __________________ Red to red, black to black. Throw the switch and stand well back!

24th May 2018, 2:10 pm	#6
emeritus Dekatron Join Date: Jan 2012 Location: Brentwood, Essex, UK. Posts: 5,345	Re: Suitable adhesives Some 50 years ago I used some of the Evostik dad had left over from sticking some Formica to reglue the spine of a paperback, and it is still secure and flexible. I just hope they don't go changing the formula.

24th May 2018, 3:43 pm	#7
Bazz4CQJ Dekatron Join Date: Apr 2009 Location: Oxfordshire, UK. Posts: 4,935	Re: Suitable adhesives I just recently bought a 250ml tin of Evostik and I have been wondering whether it is as good as it used to be. If I needed some more, I think I'd spend some time on Google to see if there are any other strong contenders for an effective contact adhesive. B __________________ Saturn V had 6 million pounds of fuel. It would take thirty thousand strong men to lift it an inch.

24th May 2018, 4:00 pm	#8
Hybrid tellies Nonode Join Date: Jan 2004 Location: 1966-1976 Coverack in Cornwall and Helston Cornwall. 1976-present Bristol/Bath area. Posts: 2,967	Re: Suitable adhesives Thanks for your suggestions. Some of the remaining glue holding the speaker feels more like rubber than normal glue which is what you need for holding a speaker in place. So I will go with Evostick or Sugru and for resealing the IF coils and for securing the ferrit rod aerial coils I will buy some beeswax. Many thanks __________________ Simon BVWS member

24th May 2018, 6:44 pm	#9
Refugee Dekatron Join Date: Apr 2012 Location: Worksop, Nottinghamshire, UK. Posts: 5,554	Re: Suitable adhesives I once bought a tin of Thixofix. It was like Evostick gel. It had better filling ability as it did not run.

24th May 2018, 7:46 pm	#10
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,959	Re: Suitable adhesives I've found nail varnish to be good for locking cores and trimmers, but I usually leave cores unlocked as they're very unlikely to unscrew of their own accord. I lock ferrite rod coils with a bit of cardboard.

25th May 2018, 12:39 am	#11
Refugee Dekatron Join Date: Apr 2012 Location: Worksop, Nottinghamshire, UK. Posts: 5,554	Re: Suitable adhesives Ferrite rods usually have the coils fixed with soft wax in my experience.