Adhesive for Sponge Pads

[James D. Farrow]

O.K. I am getting the 3M Feathering Disc Adhesive to stick the (flexible) sanding discs to the
backing plates.

I am also putting "sponge pads" between the sanding disc and the backing plate.

I understand the reason for the Feathering adhesive so that when they wear out you
can remove them for replacements.

Do I use the same adhesive to first stick the sponge pad to the backing plate or
can I use a permanent adhesive for those?

I figure I will only be replacing the sanding discs and not the sponge pad or do they
wear out too?

The feathering adhesive is expensive so don't want to have to re-glue the sponge pad
every time I replace the sanding discs if I don't have to.

Yes? No?

James

[kennyg]

I just get the disks and pads that already have the adhesive on them. They are labeled PSA.

[James D. Farrow]

I just get the disks and pads that already have the adhesive on them. They are labeled PSA.

I did too. I also got a couple that are non PSA.

For the sponge pads with the PSA ,I assume they will only glue once. When you soak the backing plate in hot water
so you can remove a worn out sanding disc to replace it ,the sponge pad will also come un-glued as well.

If the sponge pad is still good (not worn) you will have to re-glue it back to the backing plate before you attach
a new sanding disc.

What I am asking is that if the sponge pads don't wear out, why not glue them to the backing plate once with
permanent adhesive. Instead of regluing them each time with the feathering adhesive.

I know this won't come up that often (we hope) but regluing the same sponge pads over and over again seems
like an unnecessary task.

Does anyone know if the sponge pads wear out?

James

[Back]

Hi James

The sponge pads can break down over time. I do have some that are more than 30 years old. I make my flat laps and I do use heavy duty glue for the backing.

Hope that helps.

Bless
Shawn

[jakesrocks]

http://www.atsacoustics.com/item--3M-Super-77-Adhesive-16-75-oz--1018.html?d=GPGEN01&kw=1018-3MS77

The stuff is expensive, but really does the job of sticking things.

[James D. Farrow]

Thanks!

James

[jakesrocks]

James, to stick the foam down spray the plate and one side of the foam. Let the spray dry for a minute, then stick the two pieces together.

For the discs, only spray the disc. let it dry for a minute and stick it to the foam. By only spraying the disc, you'll be able to peel it off without damaging the foam.

If at some point you have to remove the foam from the plate, let it soak in acetone for a while.

[kennyg]

James said:
"For the sponge pads with the PSA ,I assume they will only glue once. When you soak the backing plate in hot water
so you can remove a worn out sanding disc to replace it ,the sponge pad will also come un-glued as well."

I may be missing the whole point but I have never had to soak the head in hot water the psa sanding disk should just peal off the foam always has for me. Are you using the black gunky stuff that comes in a tube? It shouldn't make any difference, all the adhesives I have used or seen are supposed to be water resistance hence you can use them as wet sanders maybe being hot makes the difference. They should be reusable several times before they are worn out. sorry if I'm not getting the point. Oh by the way the foam backing on a metal or plastic head will tend to tear when removing it but I never remove until it is degraded so much it won't work anymore.

[James D. Farrow]

James said:
"For the sponge pads with the PSA ,I assume they will only glue once. When you soak the backing plate in hot water
so you can remove a worn out sanding disc to replace it ,the sponge pad will also come un-glued as well."

I may be missing the whole point but I have never had to soak the head in hot water the psa sanding disk should just peal off the foam always has for me. Are you using the black gunky stuff that comes in a tube? It shouldn't make any difference, all the adhesives I have used or seen are supposed to be water resistance hence you can use them as wet sanders maybe being hot makes the difference. They should be reusable several times before they are worn out. sorry if I'm not getting the point. Oh by the way the foam backing on a metal or plastic head will tend to tear when removing it but I never remove until it is degraded so much it won't work anymore.

In another thread I was advised to get the 3M Feathering Disc Adhesive to glue non-PSA sanding discs to the back plate. This, I am led to believe, is not a permanent adhesive and the sanding discs can be removed and replaced when they wear out. I was under the impression you put the backing plate with the sanding disc stuck to it in hot/warm water to loosen them and then they just peel off. Maybe the water is not needed but I thought that's what was meant.

That works fine if you are just using sanding discs on top of the backing plate.

But I am putting a sponge pad (either PSA or Non-PSA) n-between the sanding disc and the backing plate. I don't want to use the same feathering adhesive on the sponge pad as I gather when I peal off the sanding disc the sponge pad, having the same adhesive will also peel off with the sanding disc.

That's why I was asking if the sponge pads wear out. If they don't, or at least not very often, then I want to use a permanent adhesive to
glue them to the backing plate, and only use the feathering adhesive on the sanding disc.

That way when I peel off the sanding disc the sponge pad will stay adhered to the backing plate and I don't have to re-glue it.

James

[kennyg]

Thats the point I tried to make the spong on the metal or plastic plate seems to bond more and doesn't release as easily as the sanding dish does to the spong. Maybe I'm just lucky. Like Jakesrocks said try using the feathering glue on the plate and the sponge but only on the sanding disk when putting it on the sponge.I have a new sponge for a backing plate I'll try it today and post the results.

[James D. Farrow]

Thanks!

James

[kennyg]

I'm going to have to do something about my resolution

[James D. Farrow]

Thanks!

Looks like if you don't use water the disc will peel off and leave the sponge pad there.

Thanks again.

James

[lithicbeads]

A 1200 grit worn pad with no sponge rubber backing is an excellent tool for removing small scratches or fixing bad spots on an almost finished piece. Thy cut very differently unbacked.

[mirkaba]

I use 3M adhesive. On the right hand side of my 8", on an aluminum disc, I have an 8 inch pad. Glued in the center is a 6" pad and over both an elk hide polisher that is wired on.  On the 6", right hand side, I have cow hide disc glued to pad which is glued on to a rubber flex disc. I sprayed both pieces to be glued, let sit for a minute and stuck them all together. They both seem to work Okay. I have actually worn leathers out and the glue never failed.