Here we go again . . . MK4

[Electroconducive]

Beautiful work as always.

What did you learn about the bubbles?

I saw in the video you used a heat gun to try and get rid of them.

Were you successful?

[routercnc]

Beautiful work as always.

What did you learn about the bubbles?

I saw in the video you used a heat gun to try and get rid of them.

Were you successful?

Answer is quite a lot! Although I had read lots about epoxy levelling on this site it is not until you do it yourself that you get a feel for it all. In short I made some mistakes.
It will all be in the next video but that will be some time away.

I checked the flatness and it was all over the place because of the bubbles. Where I had used the heat gun the most started to cure quicker which probably didn't help.
I tried to lap the surface back but it was taking forever and it was going to be tricky to ensure I kept both sides parallel to each other.
I think the epoxy should have been mixed slowly to avoid too many bubbles and then left in the warm bath to help some of them escape. Then pour slowly and use a stick to pop any remaining bubbles. The heat gun should be used sparingly if at all.
I had a long think about it all then took a chisel to it and took it all off. New epoxy on order plus some redesign of the channeling. I may even lay in multiple stages just waiting for it to skin over between coats. Not sure yet . . .

In short I'm back to square one but this needs to be right!

[mekanik]

routercnc
if you have access to a vacuum pump you could degas the resin prior to installation, have seen old pressure cookers used with a perspex lid, then you could place the resin in a container that can be pressurised. poly pipe going to the bottom of the container, LOW pressure air on top of resin to initiate your pour, after bleeding you resin supply pipe place that in direct contact with the pour surface and this should prevent any entrainment. initial mixing might be better done with flat stirrer figure of 8, softly softly.
Regards
Mike