Talk Composites - The Forum for Advanced Composites

Sanding between coats

http://www.talkcomposites.com/Topic34114.aspx

By Armand - 11/6/2019 12:01:39 PM

Hi I've just coated my table with glass cast 3
Will I be able to put a second coat on tomorrow without sanding or can I just go straight over it ?
Also first time at this if I sand will I still get a clear finish after the second coat ? 
Thank you 
Steve.
By Armand - 11/6/2019 12:52:36 PM

Tom (Staff) - 11/6/2019 12:35:54 PM
Armand - 11/6/2019 12:01:39 PM
Hi I've just coated my table with glass cast 3
Will I be able to put a second coat on tomorrow without sanding or can I just go straight over it ?
Also first time at this if I sand will I still get a clear finish after the second coat ? 
Thank you 
Steve.

Hi Steve,

There are a couple of ways to the multiple pour process which are as follows:

 - You could leave the first pour to reach its b-stage of curing (firm but tacky) and then pour straight on top. This will give both layers a chemical bond and give a completely seamless finish. The GlassCast 3 usually takes around 12 - 15 hours to reach this stage in a room that is a consistent 20'c

 - If you miss the b-stage, you will need to wait for this to fully cure before prepping for a second layer, this takes 24 hours in a room that is a consistent 20'c. Once the resin has fully cured, you will need to give the entire surface a slight key with 120 grit abrasive paper and then give it a thorough clean. You will then be able to pour the second layer and the resin will have a mechanical bond between each of the scratches and again, give a completely seamless finish. 

I hope this information helps.

Thanks Tom much appreciated 
Regards steve