Motorcycle Sport Bike, Road Bike, Touring Bike, Cruiser Bike Plastic Fairing Repairs

By: Plastic Welding Repairs Ltd  15-Feb-2010
Keywords: Plastic Welding, Plastic Repair, Paint Protection Film

Triumph, Suzuki, Yamaha, Kawasaki, Moto Guzzi, Ducati, Honda, Harley Davidson, Buell, MV Agusta, BMW.
Hi,  I am a specialist plastic repairer based in Levin and I repair anything & everything but, I especially enjoy sport, road bike semi rigid plastic repairs. See my website or I advise anyone; NEVER attempt to glue or attack ANY plastic with a soldering iron, it will not work, well, maybe, till just after the bike is sold---- All Thermoplastics, as against ThermoSET plastics, are temperature sensitive and have a narrow weld temp range, a non adjustable soldering iron will burn & destroy the weld area. An adjustable soldering iron will only 'MELD', it cannot perform a proper weld but, if good technique is used may do a quick, just acceptable job - not the ideal.
There is a confusion re 'gluing' and solvent or chemical welding - a glue will simply sit on top of the substrate and maybe, lock around some rough or edged areas, one nudge and it will separate. Polyethylene >PE< and Polypropylene >PP< plastics are completely impervious to Solvents/chemicals and therefore ALL & any glues. Here's a clue; PP & PE are used to contain chemicals.
There are some expensive two part adhesives that with special preparation can do a reasonable job on some plastics but I rarely use them.
The majority of road bikes utilize >ABS< type plastics which can be hot-air or solvent welded. The problem with using hot-air on ABS is, it warps, can crack while being welded even when pre-heated and, thin areas will just blow away. This explains why many hot air welds fail - the welder is afraid of blowing through so he limits the temperature which causes a poor weld, he also wont weld both sides as a welder should. These welds need a lot of Fibre Glass filler which makes the fairing more rigid, less able to flex and is likely to crack quite easily. Also, Urethane FG & most other fillers I have encountered do not adhere to semi rigid plastics that well.

A good weld is where the substrate and the rod/weld material melt at the correct temp or liquidity and adjoining molecules start holding hands! It takes some knowledge/experience and excellent equipment to be able do this on every weld.

On the other hand, Solvent welding ABS type plastics produces no warping or cracks & therefore a minimum of refinishing. Extra reinforcing material can be easily added where needed, tight areas can be accessed, small lugs can be repaired & re attached, decals can be better preserved. The only negatives for solvent welding are; there is a curing time which increases with the thickness of added material. Incorrect procedure can make repainting a problem. Aeration of the added material has to be avoided to effect a strong weld, this can be critical.
I have developed, through experience, the technology required to provide guaranteed repairs to ABS plastics.

Performance Sport or Road bikes may have front fairings made of nylon >PA< (which has to be hot air welded only), others may be ABS or some alloy mix like >PA/PBT<. All plastics have their own unique properties and repair techniques, one plastic type cannot weld another.

Brian The Plastic Doctor

Keywords: Headlight Lens Repairs, Italian Motorcycle Plastics, Jetski Plastic Repairs, Motorcycle Repair, Paint Protection Film, Plastic Repair, Plastic Welding, Plastic Welding Repairs, Quad 4x4 Plastics, Road Bike Plastics, Sport Bike Plastic Repairs, Tail Light Lens Repairs,

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