NOT STRICTLY A REPAIR FILLER

I'm sure others have heard of this stuff , I use it very regular on all sorts of things including gluing two halves of F1 tubs together, Or in fact for the application in question.

Once it has set it can be rub'd down "BUT" make sure its not loaded on as its tuff old stuff to rub down

The only problem is its quite expensive

http://www.meister-abrasives.ch/en/__da ... nglish.pdf

Oh and you can add pigments but I would look at painting over for best results

Dino,

The stuff that I have been using is ISOPON P40 fibreglass filler, it seems really good,

Well I started to repair a couple of cracks on the bonnet, as I began to cut into the crack I found that 9 out of 10 times the crack was right over a air bubble in the gelcoat or first layer of fibre, has anyone found this before, I have also found a number of these bubbles appearing as I sand back the gelcoat ready for painting, not knowing much about fibregalss is this a common thing?

Anyhow here's a couple of pics of the job so far.





I hope I'm doing it right

Yep I found a few air bubbles behind the gel coat when I prepped mine, with the worse areas being on complex bends where the matt has not sat down 100% against the gel coat as you have found on the front splitter.

Also the areas where you grind out cracks always get 10 times bigger than you think they will be!

After building back up the shape be careful when sanding back as not to loose the shape or induce high or low spots, it takes time and it will be worth it as once its painted any imperfections are magnified, always use a rubbing down block and avoid fingers/palms of hands as much as possible, as you may induce faint grooves into the surface.

I always use a guide coat, for example some cellulose matt black. make sure it is compatible with your chosen final paint.

West