carbon wet-out consistancy issues.

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carbon wet-out consistancy issues.

Author	Message
fgayford	fgayford posted 10 Years Ago HOT Post Details
Group: Forum Members Posts: 433, Visits: 1.2K	jono (04/03/2015) hi all, i'm having issues with the final part not wetting out enough consistently. I am using the same mould, same layers, same resin and temperature conditions. absolutely no leaks in the bag and obviously the same vac pump. it visually appears to infuse at the same rate every time but only 1/3rd of the time it's actually fully wetting out the weave. it seems to be luck of the draw for me? i'm using a low viscosity resin, pulling a vacuum for at least 40 mins before infusing. i've tried clamping off the vac line and resin line like the easy composites tutorial, i've also tried allowing the resin to almost empty the pottle and only clamping the resin line and allowing excess to reach the catchpot and letting it cure wit vaccuum pump going. also moving around the resin feed/vac lines. i honestly have no idea what the cause is. would appreciate any help here. this is what my parts come out like 2/3 of the time. yet sometimes my parts come out perfect like this (same exact mould)-ignore the traces of clay on it- any idea what could be doing this? i'm doing a fully dry layup, no glue or gel coat (its a brake duct) should i perhaps consider brushing/spraying a fine layer of resin down and allowing it to almost fully cure to a late stage of tack and then layup/infuse? It sounds like you are doing things right, but there is resin missing in your voids. My guess is that you are cold. I heat my molds to about 80F (sometimes 90F) and make sure my resin is also at about 80F. I would always use the slow hardener so I don't get caught. Mix many small batches rather than one big batch and keep adding to your resin intake pot. Also don't infuse too fast, I control the flow with my cut off clamp, slow and steady front. I always let resin get to the catch pot and then cut off the vacuum line first, count to 10 and then cut off the resin line. Give it a try and see what happens! Hope this helps. Fred Give th ,
	Reply Like 6
jono	jono posted 10 Years Ago HOT Topic Details
Group: Forum Members Posts: 11, Visits: 63	hi all, i'm having issues with the final part not wetting out enough consistently. I am using the same mould, same layers, same resin and temperature conditions. absolutely no leaks in the bag and obviously the same vac pump. it visually appears to infuse at the same rate every time but only 1/3rd of the time it's actually fully wetting out the weave. it seems to be luck of the draw for me? i'm using a low viscosity resin, pulling a vacuum for at least 40 mins before infusing. i've tried clamping off the vac line and resin line like the easy composites tutorial, i've also tried allowing the resin to almost empty the pottle and only clamping the resin line and allowing excess to reach the catchpot and letting it cure wit vaccuum pump going. also moving around the resin feed/vac lines. i honestly have no idea what the cause is. would appreciate any help here. this is what my parts come out like 2/3 of the time. yet sometimes my parts come out perfect like this (same exact mould)-ignore the traces of clay on it- any idea what could be doing this? i'm doing a fully dry layup, no glue or gel coat (its a brake duct) should i perhaps consider brushing/spraying a fine layer of resin down and allowing it to almost fully cure to a late stage of tack and then layup/infuse?
	Reply Like 7