Hey guys
I will have my vac pump sorted this weekend after a lot of running around getting all the bits
And should be ready to glass my 8"x27" soon aim going 2oz innegra +6 bottom - 2oz innegra +6+4oz patch on deck
I am hoping to glass bottom turn over (while resin is still wet) and glass top then place in bag and vacuum press the board and bake in hot box
I have glass plenty of boards but first time vacuum bagging and was wondering if this process is do able . Also I was apply layer of peel ply and maybe shade cloth ( or fine silt control fabric as shade cloth may texture the surface ) as breather but have been told I may need a layer of breathable release film on top of peel ply and under breather to stop to much resin being drawn
Can u pull off peel ply and breathers off once resin has completely hardened or better when resin has just hardened.
Problem is if u go and buy all these different films they nearly cost as much as the glass
Anyway any tips would be greatly appreciated
Thanks brad

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BL said...

Hey guys
I will have my vac pump sorted this weekend after a lot of running around getting all the bits
And should be ready to glass my 8"x27" soon aim going 2oz innegra +6 bottom - 2oz innegra +6+4oz patch on deck
I am hoping to glass bottom turn over (while resin is still wet) and glass top then place in bag and vacuum press the board and bake in hot box
I have glass plenty of boards but first time vacuum bagging and was wondering if this process is do able . Also I was apply layer of peel ply and maybe shade cloth ( or fine silt control fabric as shade cloth may texture the surface ) as breather but have been told I may need a layer of breathable release film on top of peel ply and under breather to stop to much resin being drawn
Can u pull off peel ply and breathers off once resin has completely hardened or better when resin has just hardened.
Problem is if u go and buy all these different films they nearly cost as much as the glass
Anyway any tips would be greatly appreciated
Thanks brad

my first attempt failed, not sure if i left the vaccuum on too long or if resin heated too much during the reaction phase, but my nicely shaped blank started sinking, either the vaccuum sucked too much air out of the E.P.S. or it started melting.

Alot of information on the Swaylocks.com/forum about all of this.

Do one skin at a time.

Is it a sandwich construction?
Is it EPS core?
If not sandwich u need to be very careful with vac pressures or it will crush.

I would recomend using a peel ply, then perforated plastic film, then a light bleeder cloth, then a non-ferforated plastic film then your shade cloth (as ling as its a fine weave.

Id you use a perforated film between peel and vleeder cloth you will be able to remove the peel ply without damaging the board.

Spend the money on the perforated. if your careful you can re-use much of it.
for non-perforated you can use garbage bags cut up.

are you using epoxy?

Be careful using vac while in the hot box.
Hot foam is softer (especially EPS) and will crush easier.
Hot resin (before it gels) flows more and will bleed in to your bleeder cloth quicker, maybe pulling too much resin out of the laminate. resin:glass ratio of of 1:1 by weight is a good starting point.

Practice and very solid preparation will make it fall together.
Have veerything cut and stacked in the correct order for layup including having ur vac bag all pre made.
test your vac pump before your mix ur resin. ive been cough out before!

Just a few quick tip, but check swaylocks out as mentioned!

Put some thought into how you are going to prevent too much resin being drawn into the foam too....I'm assuming it's EPS without sandwich skin.
Research correct vac pressure.....getting it wrong could be disasterous.
Deffinately do one side at a time.
If you haven't got a stringer you might need a rocker table to maintain correct rocker.
Good luck!!

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Bertie said...
Do one skin at a time.

Is it a sandwich construction?
Is it EPS core?
If not sandwich u need to be very careful with vac pressures or it will crush.

I would recomend using a peel ply, then perforated plastic film, then a light bleeder cloth, then a non-ferforated plastic film then your shade cloth (as ling as its a fine weave.

Id you use a perforated film between peel and vleeder cloth you will be able to remove the peel ply without damaging the board.

Spend the money on the perforated. if your careful you can re-use much of it.
for non-perforated you can use garbage bags cut up.

are you using epoxy?

Be careful using vac while in the hot box.
Hot foam is softer (especially EPS) and will crush easier.
Hot resin (before it gels) flows more and will bleed in to your bleeder cloth quicker, maybe pulling too much resin out of the laminate. resin:glass ratio of of 1:1 by weight is a good starting point.

Practice and very solid preparation will make it fall together.
Have veerything cut and stacked in the correct order for layup including having ur vac bag all pre made.
test your vac pump before your mix ur resin. ive been cough out before!

Just a few quick tip, but check swaylocks out as mentioned!

Hey Bertie thanks for the info mate
Ian not doing sandwich ,using h grade eps and kinetics epoxy
Thanks for info on the film layers could save me a lot of hassle
I will probably only put in hot box to cure resin once it has semi hardened so I will peel of peel ply etc then cure resin in box
Thanks again for tips mate

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Deano72 said...
Put some thought into how you are going to prevent too much resin being drawn into the foam too....I'm assuming it's EPS without sandwich skin.
Research correct vac pressure.....getting it wrong could be disasterous.
Deffinately do one side at a time.
If you haven't got a stringer you might need a rocker table to maintain correct rocker.
Good luck!!

Hey Deano
Yeh mate eps no sandwich
The perforated film controls resin being drawn out and seems to be worth money to put on
One side at a time seems to be the go as we'll ,
They reckon 5-8 " is enough vacuum aim just waiting on a gauge so I can calibrate my pump
I was worried about the rocker being pulled out but thought the blank would be stiff enough has no stringer but I may make up a rocker jig just to be surer
Thanks for info

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sharpie said...

BL said...

Hey guys
I will have my vac pump sorted this weekend after a lot of running around getting all the bits
And should be ready to glass my 8"x27" soon aim going 2oz innegra +6 bottom - 2oz innegra +6+4oz patch on deck
I am hoping to glass bottom turn over (while resin is still wet) and glass top then place in bag and vacuum press the board and bake in hot box
I have glass plenty of boards but first time vacuum bagging and was wondering if this process is do able . Also I was apply layer of peel ply and maybe shade cloth ( or fine silt control fabric as shade cloth may texture the surface ) as breather but have been told I may need a layer of breathable release film on top of peel ply and under breather to stop to much resin being drawn
Can u pull off peel ply and breathers off once resin has completely hardened or better when resin has just hardened.
Problem is if u go and buy all these different films they nearly cost as much as the glass
Anyway any tips would be greatly appreciated
Thanks brad

my first attempt failed, not sure if i left the vaccuum on too long or if resin heated too much during the reaction phase, but my nicely shaped blank started sinking, either the vaccuum sucked too much air out of the E.P.S. or it started melting.

Hey sharpie
Doesn't sound good with your board mate ,maybe too much vacuum hey I may do a trial run once I get a gauge installed on pump
May see out on the water on day if u r down Wambi
Thanks brad

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DarrylG said...
Alot of information on the Swaylocks.com/forum about all of this.

Thanks darryl
I have previously been to sway locks but have forgotten about this time
Thanks

use a pressure relief valve to control suction pressure