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Hot coat hints and tips

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alpaia
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Re: Hot coat hints and tips

Postby alpaia » Sun Jun 07, 2020 11:25 pm

Thanks TomW for the detailed process, I will apply it next time.
It looks like I was ok with avoiding contamination & cleaning with alcohol (no fish eyes) but neglecting the dropping temp and de-gassing of resin so always getting bubbles.

RichR2
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Re: Hot coat hints and tips

Postby RichR2 » Sun Jun 21, 2020 7:03 pm

TomW wrote:
Thu Jun 04, 2020 9:25 pm
jaros wrote:
Wed Jun 03, 2020 7:06 am
TomW wrote:
Tue Jun 02, 2020 9:43 pm
It's more involved than that.

My entire process:
Clean shop, vacuum up everything. Preferably a day before.
I vacuum off the board last on that clean up day.
Don't turn on your vacuum cleaner the day you do the coat. Keep air still.
I put on vinyl gloves.
Wipe off board with tack rag, wipe off board with denatured alcohol ( dna). Use good lint-free paper toweling.
Tape rail. Wipe off with DNA, tack rag again.
Turn off heat in shop.
Mix and degas resin.
Pour on resin, using high quality brush, brush diagonally one way, then the other. Brush rails, brush longitudinally from center, finish with rails.
Get out of shop.
3 hrs later, remove tape from rail and turn on heat to 18c.

The principals are: dust free shop, no air movement, dropping temperature, no hand oils on board, tack rag removes dust stuck to board from static charge, no air bubbles in resin, don't over work brushing that can add bubbles.
Nice description!
Do you clean the brush for another use or do you use a new brush every time? Thanks!
New brush every time.
/quote]

Just followed all your suggestions Tom, brilliant finish obtained, which wont require much sanding. Thanks for the advice.

Matthijs94
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Re: Hot coat hints and tips

Postby Matthijs94 » Wed Dec 23, 2020 9:12 pm

How much resin do you guys usually use for a hot coat? Same amount you would use while laminating? Trying to find the best weight/toughness ratio.

TomW
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Re: Hot coat hints and tips

Postby TomW » Thu Dec 24, 2020 11:46 pm

Matthijs94 wrote:
Wed Dec 23, 2020 9:12 pm
How much resin do you guys usually use for a hot coat? Same amount you would use while laminating? Trying to find the best weight/toughness ratio.
I use about 25% less than a lamination of same area. A bit drips off.


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