Delamination - Topsheet - Quick question

[EnzioL]

Ive managed to do my first skis with a vacuum pump, everything went quite ok except the delamination of the topsheet. If feel that the amount of the epoxy was enough (around 550g per ski)

I sanded the topsheet with smooth sandpaper.

Is the only way to get the topsheet to bond to epoxy to flame it?

or has the vacuum dried the toplevel of epoxy (last layer of fiberglass and topsheet) so there is not enough epoxy to bond?

[Richuk]

You'll receive better advice if you say what topsheet you were using : )

[EnzioL]

Hi,

Sorry, Im using DuraClear, 0.5mm thick, clear stuff, front matt back gloss.

[deepskis]

Hi!
Duraclear is sanded and flame treated before shipping. Just cut the piece and start laminating. If that does not work, there is a problem with your resin.

550g/ski is a lot..?

[twizzstyle]

I use about 450-500g of epoxy per ski (but a lot of that gets squeezed out...)

You should be flaming all plastics just prior to layup.

[Dr. Delam]

Maybe I am lucky but I never flame anything before layup. And I have done all sorts of wrong things such as clean with acetone, not wear gloves when handling materials, rip edges off and reglue, and not a single hint of delam. Of course I am much more careful now but I think most of what people think is necessary is not.

[NinetyFour]

and I have done all sorts of wrong things such as clean with acetone

I was reading an old thread of Rockaukum's and I am still somewhat confused as to final topsheet, base, and tipspacer prep before layup. He mentioned a cleaner from Crown Plastics and I was wondering if it was necessary and still used by many on materials pre-layup; and what the proper sequence is between this treatment (if used) pre-layup [flame then treat, or treat then flame?] If it is a necessary treatment, are there any substitutes? (MEK, Methyl Alcohol, Toluene, Gunwash...) If not, just keep flaming away?

Sorry for any threadjacking that may occur OP.

[sammer]

I've never flamed anything except some really old dirty tip spacer.
I washed it with acetone then flamed, no bonding issues.
I've only ever had 1 delam, still haven't figure out the cause but I must have screwed up somehow.

sam

[EnzioL]

Did some test laminating and:

The topsheet had actually a cover sheet over it, so wrong side down was my problem.

[sammer]

Did some test laminating and:

The topsheet had actually a cover sheet over it, so wrong side down was my problem.

Yup...
That'll do it!

[rockaukum]

Front matt, back gloss? top is gloss, back (or bonding surface) abraded. I used to use acetone and quit all together and now just wipe with a clean damp cloth or do nothing at all. So far so good.
RA