For strength, there needs to be a high ratio of glass to epoxy, thus one
squeegies (sp?) out as much resin as possible. If the selved edge of the
narrow piece creates a step that wasn't sanded down, the wider layer of
glass will bridge the step and the space under the bridge will be filled
with air. That's why the plastic sheet overlay is so effective.

Roger

http://home.insightbb.com/~derbyrm

wrote in message
ups.com...
cavelamb wrote:
(corrected to bottom posting to preserve teh thread)

If you go from the smallest piece first you have a chance of trapping
concentric rings or squares of bubbles in the laminate. Sam


wrote:

Can you explain a bit more on your observation of this problem? I
don't quite follow you.

Thanks.

Jay Chan


You need to try it to see for yourself.

Bubbles are bad.

The are air spaces inside the laminate.

Not good for dimensional stability - or strength

But why putting the smallest piece first will increase the chance of
having air bubbles inside the laminate?

Jay Chan