Marianne Martinez
If you're looking to install a Volkswagen floor pan without welding, you might be concerned about the longevity of your repair job. While welding is often considered the best method for a permanent fix, there are alternatives for those who don't have the equipment or expertise. One option is to use a rust converter and putty to fill in small holes, but this may not be a long-lasting solution. For a more durable fix, you can grind away the rust, apply a primer or epoxy to seal the metal, and then use glass or fibreglass to close the holes. This method can provide several years of service before requiring another repair. If you're unsure about the process, it's always a good idea to seek professional help or advice from experienced individuals to ensure your car remains safe and reliable.
Characteristics and Values table for installing Volkswagen floor pans without welding
| Characteristics | Values |
|---|---|
| Hole size | Tiny rust holes, pinholes, nickel and dime-sized holes |
| Hole location | Middle of the floor, against the edge |
| Repair method | Grind away rust, apply epoxy primer, seal with POR-15 or epoxy, cover with glass |
| Tools | Preval sprayer, die grinder with a cutoff wheel, body hammers, dollies, chisels, pry bars, wire wheels |
| Alternative methods | Butt weld, lap weld, plug weld |
| Welding challenges | Prone to ruining panels, extensive work, prone to popping |
| Alternative materials | Sheet metal screws, panel adhesive |
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What You'll Learn
Use a rust converter and putty to fill in tiny holes
If you're looking to repair tiny rust holes in your Volkswagen floor pans without welding, one approach is to use a rust converter and putty to fill in the holes. This method can be effective, but it's important to note that not all converters work long-term, and the putty may eventually break free and fall out as the hole enlarges and the panel flexes.
To start the process, you'll need to remove any traces of dirt, grease, or wax from the area you plan to treat. This can be done with a wire brush or wire wheel, and you should also sand the area to ensure the surface is clean and ready for treatment.
Once the area is prepared, you can apply the rust converter. Rust converters work by converting surface oxides from active Iron Oxide to inert Iron Tannate. It's important to choose a product with a lower acid content to avoid accelerating corrosion. Follow the manufacturer's instructions carefully, as improper application can leave residual acid on the surface. A recommended product is Rustbuster FE-123, which is less acidic and uses modern rust conversion technology. Lightly apply the converter with a paintbrush, allowing it to treat the corrosion rather than acting as a coating.
After applying the rust converter, you'll need to wait for it to take effect. The treated area will turn into a black or deep purple hard and stabilised surface, indicating that the converter has worked. At this point, you can proceed with filling the holes with putty.
When using putty or filler, it's important to follow the instructions on the product you've chosen. Most fillers require mixing with a hardener before application. Since body fillers don't stick to paint, you must ensure that the area is properly sanded and prepared. Apply the filler to fill in the tiny holes, following the instructions and allowing it to cure.
While this method can provide a temporary solution, it may not be as durable as welding. If you're concerned about the longevity of the repair, consider seeking professional assistance or exploring other repair methods.
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Grind away rust, apply epoxy primer, and cover with glass
If you are repairing tiny rust holes in your Volkswagen floor pans and absolutely cannot weld, glass can be a reasonable alternative.
First, grind away or cut away all traces of the rusty areas. You can also use a drill-mounted wire brush to clean away the rust, as this will not thin out the floorpan. Once you have removed the rust, apply a rust remover like Mastercoat Metal Prep & Rust Remover or Ospho to dissolve any remaining rust.
Next, apply an epoxy primer to seal the metal against moisture. You can use a preval sprayer to apply the primer, making sure to coat both the front and back of the metal. Allow the primer to dry completely between coats.
Then, apply glass or fiberglass over the holes to close them up. You can mix resin with fiberglass mesh and use a squeegee to work it into the floorpan. Once the glass or fiberglass is in place, sand it down a bit to smooth out the surface.
Finally, spray another coat of epoxy primer and then apply an undercoat or finish coat.
Please note that while this method can provide a long-term solution, it may not last forever. Even with welding, if the surface is not primed correctly or the patch is not perfect, moisture can get in and cause rust.
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Butt weld panels for extensive rust
If you are dealing with extensive rust, butt weld panels are a good option. Butt welding is a challenging technique that requires a lot of work and precision. The panels must fit together perfectly, and the weld must be performed correctly to avoid ruining the panels.
To butt weld panels, you will need to prepare the joint correctly and set up your welder appropriately. It is recommended to use a gas shield MIG setup for better weld control and to prevent issues with thin sheet metal. If you have a 110V welder with independent power and wire speed settings, start with the third-highest power setting and 35% wire speed for 0.025" wire. Practise getting the dwell timing right: too long and the heat will be too high, too short and you won't get good weld penetration.
When performing the butt weld, leave a gap slightly bigger than 0.6mm. After a few tacks, the gap will shrink. Pull the trigger on your welder after putting the wire through the gap. Grind flat any part of the weld bead that sits proud.
For extensive rust repair, it is important to take your time and use patches with butt welds. Hammer and dolly the patches into shape, and stitch weld them into place by welding in different spots to minimise heat and warping. Use a body file to level out any high and low spots.
Remember that butt welding is a skill that takes practice to master. With patience and the right techniques, you can successfully repair extensive rust with butt weld panels.
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Plug weld panels for quicker, simpler results
Plug welding is an alternative to spot welding and is commonly used by vehicle manufacturers when there is insufficient access for a spot welder. It is also used for DIY car restoration, particularly when working on panels flanges that would have originally been spot welded. When done properly, plug welds tend to be stronger than the original spot welds.
To plug weld panels, you will need to drill a hole of about 7.5mm to 8mm in the front sheet of metal. Smaller holes of about 4mm may be drilled, but these may not penetrate the metal. Thicker sheets may require a slightly larger hole size. Once the hole is drilled, clamp the front sheet onto the back sheet and weld around the outside of the hole, finishing in the centre.
It is important to get your wire positioning correct and to use the correct umbilical for thin sheet work. You may also need to adjust the power settings depending on the thickness of the sheets.
Plug welding is a much more suitable technique for inexperienced welders than spot welding, as it is easier to make good-looking welds with no real strength. However, it is important to note that plug welding may take longer than spot welding and there is a risk of trapping moisture, which could lead to rusting.
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Use panel adhesive with plug welds for extra security
While welding is a popular method for repairing rust holes in floor pans, it is not the only option. If you're looking for an alternative solution that doesn't involve welding, consider using panel adhesive with plug welds for extra security. This method combines the use of strong adhesives with plug welding, a type of spot welding, to create a secure and long-lasting bond.
Panel adhesive, such as epoxy adhesive, has been used in the automotive industry for decades. Manufacturers like General Motors have been gluing panels on vehicles since the 1980s, and adhesive bonding is often used in conjunction with welding processes for added strength. When used correctly, panel adhesives can provide a strong and fully sealed surface that protects against water incursion and rust.
The process of using panel adhesive with plug welds involves applying the adhesive to the floor pan and then using plug welding to create a series of small welds that hold the panels together. This combination provides both immediate strength from the welding and the long-term bonding power of the adhesive. It's important to follow the manufacturer's instructions when using structural adhesives, as factors like temperature and humidity can impact their performance.
Additionally, when using panel adhesive, it's crucial to ensure proper clamping of the panels. Too much clamping pressure can squeeze out the adhesive, resulting in a weak bond, while insufficient clamping can affect adhesion. This process may require more clamps than traditional plug welding to hold the panels in place until the adhesive sets.
When deciding between panel adhesive and welding, it's important to consider your skill level and the specific application. While welding is often considered the standard for structural repairs, panel adhesive can yield better results for those who are not skilled welders. However, it's worth noting that some manufacturers, like Ford, recommend weld bonding, which combines adhesive with resistance spot welding, rather than relying on adhesive alone for structural repairs.
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Frequently asked questions
If you are unable to weld, you can use a glass alternative. First, grind/cut away the rusty areas. Apply some epoxy primer with a preval sprayer to seal the metal against moisture, then apply glass over the holes. Sand it down and spray another coat of epoxy and some undercoat.
You will need an assortment of tools such as a die grinder with a cutoff wheel, body hammers, dollies, chisels, prybars, wire wheels, and a reciprocating saw.
Overlap the panels and butt-weld the floor pans. Using a weld-through primer will help with rust issues between the panels. You can also use panel adhesive to put the floors in, along with some plug welds.
You can treat rust by grinding it away and applying fiberglass and POR-15 to seal it. This method may only be a temporary fix, lasting 2-5 years.
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