What’s enough “tooth”?

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jbo_c
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What’s enough “tooth”?

Post by jbo_c »

Beginning filling the weave today. Sanded with RO with 60 grit. That gets the high spots best, of course, but the small places that need fill still have a sheen.

If I sand enough to get those, I’ll really be into the glass. So the question is “is this ready to fill?”

And if not, how to scuff in all those little dips so it is ready?

Pics below(if I do it right.).

Thanks.

Jbo
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IMG_8204.jpeg
IMG_8200.jpeg

fallguy1000
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Re: What’s enough “tooth”?

Post by fallguy1000 »

Is that all down or are those air pockets? Push on them with a screwdriver. You cannot have air voids on a hull bottom or it will pressure delam, quickly for every increment in speed.

If they are air pockets; they are many and should be ground off.

If they are humps of glass; you did a poor job of consolidation (sorry). Use a fin roller and go over every inch of a laminate several times and in the proper direction when wetting out..

If the glass is solid; then go in there with some 40 grit paper by hand and scratch it up. It is the cost of errors laminating.

On the bottom picture; there is only one spot I'd sand by hand.

You are already into the glass some, so I'd put a coat of clear epoxy down; followed by another one in 6-8 hours.

The top picture needs clear epoxy and then fillers as well..
Last edited by fallguy1000 on Thu Jun 01, 2023 10:49 am, edited 1 time in total.
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fallguy1000
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Re: What’s enough “tooth”?

Post by fallguy1000 »

An alternative to grinding out voids is to fill each one with clear epoxy. This is done with snubnose injection needles and 10cc syringes. You drill two holes same size as the needle in each void ahead of time and then inject..

Jeff ought to carry the needles here; not sure..
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pee wee
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Re: What’s enough “tooth”?

Post by pee wee »

Hindsight being what it is . . . from here you need to scratch up any glossy area, and a wire brush is an option. Since you're past the primary bond window it's mechanical bond to prioritize.
Hank

jbo_c
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Re: What’s enough “tooth”?

Post by jbo_c »

It’s not bubbles. It’s “unprofessional” glassing. I’ve gotten better - a little. :)

Will a green scrub pad give enough tooth? That’s the best thing I’ve found to get in there and take off the gloss without eating glass. This glass on the sides isn’t structural, so not too concerned with taking it off, but would rather leave it on. Glass bubbles are relatively cheap.

Jbo

jbo_c
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Re: What’s enough “tooth”?

Post by jbo_c »

- and in defense of my glassing(I hope.), these pictures give a little perspective with a straight edge over that same area as in the pic. All those high spots are well less than 1mm. The original pic made them look much worse than they are in my opinion.

Jbo
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jbo_c
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Re: What’s enough “tooth”?

Post by jbo_c »

Here’s another pic. An American dime is several times too thick to get under there.

Jbo
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fallguy1000
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Re: What’s enough “tooth”?

Post by fallguy1000 »

I am sorry, but those bear all the signatures of voids which look like a flow..

Try to cut one open with a utility knife.

This can be caused by missing consolidation, air under the part missed in consolidation, gelation before consolidation..

It appears to be db400 or 12oz biax which can easily entrain air under two layers.

It won't hurt anything to check for movement and to try to cut into one.
IMG_0541.png
Last edited by fallguy1000 on Thu Jun 01, 2023 11:59 am, edited 2 times in total.
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jbo_c
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Re: What’s enough “tooth”?

Post by jbo_c »

Definitely not voids. I promise. I’ve had my share. :) 100% confidence on that.

Jbo

jbo_c
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Re: What’s enough “tooth”?

Post by jbo_c »

fallguy1000 wrote: Thu Jun 01, 2023 11:54 am Try to cut one open with a utility knife.
I’ll give it a shot and hope not to prove you right. LOL

Jbo

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