spraying fibreglass

[rivett]

Hi, I've got a seat hump for my 600 Fazer,ive had to alter the hole centres to suit the bike and then glass fibre the new positions in,could someone give me an idea on what to use,i.e sealers or whatever you need, as i would like to resray the whole thing to suit me bike, Thanks for any help you can offer.
Rivett.

[risticuss]

Not sprayed fibreglass before but mainly perspex, but I'd assume just a rub down with sandpaper to key the surface and a wipe over with sone meths to clean it up. Then a few coats of standard acrylic primer. Knock that back and then your choice of colour.
I defer to those with experience of fibreglass to correct me if I'm wrong :-)

[mickvp]

I painted a fibreglass bumper on an old car before after a car park bump cracked it and put a small dent in it, just sanded back the repair, filled with cataloy (isopon P38), sanded back smooth again, then just painted as normal - primer, colour, clear with sanding in between (multiple thin coats of each stage too).

looked fine when it was finished, and was still looking good when I sold the car, but I'm not 100% if that was the correct procedure or not, sorry.

[ChristoT]

What's the original finish? You will struggle to get a goid finish on pure glass fibre, but a better one with gelcoat. Use a fine grade of paper when sanding: you only want to sand the gelcoat/resin, not the fibres. Nor do you want to see where you've scored the part through the paint!

[midden]

For the respray I would start with filler primer.  Not an expert thought, but it worked for me when I used it some years ago

[karlo]

First question should be

Is the actual seat hump fibre glass or some type of plastic?

[rivett]

Hi Karlo,
The inside is very smooth ,so I would have thought some kind of plastic , I roughed the surface to take the fibreglass and it will need some filler on the outside , so I think a sealer will be required.

[karlo]

To paint you will need an ahedesion promotor also known as plastic primer. Rub over the cowl with 600 or 800 wet and dry apply your plastic primer and then you can use normal primer over the top.

[karlo]

Use isopon p40 or similar to fill the holes.