.. can be like trying to nail Jello to the wall.
While starting on a model boat project that involves an ABS hull, the question came up how to best glue things to plastic: Wooden bulkheads, deck, metal drive tube, other plastic parts, ...
This specific boat I'm about to build is a Graupner Bugsier 3. Its hull is made from ABS plastic. For what it's worth, the site http://www.kuederli.com/bugsier3/ has a very nice description of building this kit. It does mention re-enforcing and sealing the hull with epoxy and glass mats, but doesn't mention a specific type of epoxy. Based on what I learned, plain epoxy will not work at all. The kit's instructions recommend Stabilit Express. Stabilit Express is a very good 2-component glue:
- Nicely bonds to ABS, wood, metal, anything
- Gap-filling
- Sets in a short time
- Can be drilled, sanded
So I tried various glues in a very unscientific way: Glue snippet of ABS plus piece of wood to ABS, see how it holds up to me trying to pull it apart.
Here's what didn't work:
- Various Epoxies (Tower Hobby, DevCon 30 min, UHU Plus endfest 300, Loctite Heavy Duty 5min, ...) - Usually a good bet for any glue task, but doesn't stick at all to ABS.
- JB Weld MarineWeld, PC-11 Marine Epoxy - May be more resiliant to UV and water, but don't help with ABS.
- Alumilite casting resin - Seemed like a good idea for flowing into bottom of hull to make is watertight, closing every little pinhole, but peels right off the ABS when hard.
- JB Weld - Won't stick.
- Gorilla glue - The foaming polyurethane variety. Very messy, doesn't stick to ABS.
- Contact cement - Spread on, let dry, then press parts together. Seem to stick, but separate easily once the glue dries.
- Stabilit Express - we knew that.
- UHU Hart - Nice for bonding wood to ABS, but also hard to obtain in the USA.
- Acetone - sneaks into smallest gap, melts the ABS, gives perfect bond, but needs perfect 'fit'. Not gap-filling at all, doesn't bond to anything else.
- ZAP Slo, gap-filling CA - May be even better if surface is wetted with acetone just before adding CA. Since the
- DevCon Plastic Welder, 'cream' colored - Smells a lot like Stabilit Express, may be the closest to it.
- Loctite Plastic Bonding System - A pen-type heptane activator plus a CA-type glue.
- Loctite Plastic 5min Epoxy - Not to confuse with regular epoxy, this one somewhat works on ABS, but not as well as DevCon Plastic Welder nor the CA-type Bonding System.