Question 1

This may sound foolish but what is the difference between Weld-on 3, 4, and 16? I need to use it on black and white acrylic.

Accepted Answer

Just additional information from my recent purchases, testing, and results. I was wanting to bond PETG 3D prints and found that between 3, 4, and 16, 3 was the only one that produced a strong unbreakable bond. After several days of curing, the bond with product 16 was able to be broken with only low-moderate force. 4 was definitely stronger than 16, but 3 was the only one that was able to bond PETG sufficiently such that I couldn't separate the parts without breaking them.

Question 2

Can this product be used to repair a turntable dust cover? The dustcover has cracks I want to bond together in such a way they are hardly noticeable.

Accepted Answer

Yes, the trick is to squeeze the cracks as tight together as you can, then tape with Scotch tape, the new stuff, from the inside, then just touch the crack with a needle tip bottle and put just enough to fill the crack, the crack will be almost invisible when it’s full. Don’t over do it, you don’t need any on either the upper or lower surface, just enough for the  surface tension of the glue to pull it into the crack. What it does is to melt the filled crack together from the inside of the crack itself. The next day, the repair will be as strong as the original plastic. If you use too much it will actually be stronger, but you will have a scar like seam. I’ve most recently used it to repair plastic motorcycle turn signal stalks.

Question 3

Can I use this to bond acrylic to other (non-acrylic) plastic?

Accepted Answer

There are a lot of "non-acrylic plastics." From the Product Description: "It will also form strong bonds with other thermoplastics such as polystyrene, CAB (cellulose acetate butyrate), and polycarbonate to themselves. It is not recommended for cross-linked acrylic."

Question 4

Is this safe to use with fish aquarium?

Accepted Answer

If the product is allowed to cure for a long period, it is safe.

Brand	Weldon
Material	Acetate,Acrylic,Plastic,Polycarbonate
Compatible Material	Plastic, Acrylic
Item Form	Liquid
Special Feature	Strong
Colour	Clear,White
Item Package Quantity	1
Package Information	Bottle
Item Volume	4 Fluid Ounces
Manufacturer	Weldon
Item model number	CECOMINOD039446
Package Dimensions	15.2 x 10.2 x 5.1 cm; 127.01 g
ASIN	B0096TWKCW

4 Acrylic Adhesive 4 Oz&Applicator Bottle With Needle, Clear&White

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