What solvent are you using to thin your epoxy for vacuum infusion? By what percentage are you thinning it? This would not be those heavy bodies epoxies like “flag” or “gluing” epoxies. I’m speaking of the stuff that is already thin when part A & B are mixed.
I will try VER for infusing later down the road. I’m not trying to save money here by using the cheapest resin.
Why thin, just buy the correct Epoxy for your use.
I have also found out that Epoxy thins out more than the resin base is in the container when the hardeners is added too. Also. leaving the Epoxy out in the sun a little before adding the hardener also thins it out too.
Good ideas Werksberg 
Thank you
hey what brand of viscometer do you guys use?
Your welcome!
After you have gained enough experience to make saleable parts, you are likely to find that you dont have any need for a “viscometer”…whatever that might be.
If you modify the resin and find that it does not work properly, the suplier will be able to do little to help you find the cause of the failure. You really should buy the correct infusion resin for the job rather than try and modify a hand lay up resin.
Splint
Might also be a pretty good idea to get some basic experience of making simple hand lay up parts, before attempting to do use RTM process to make CF parts!
What is the difference between VIP and RTM?
RTM uses two very thick, well thought out, and calculated moulds. It uses vacuum to seal the mold, but, pressure to inject the resin through the glass. It allows for very quick part/mould turnover. Like 20 minute cycles. Either both or one half of the mould are heated internally to speed up the cure cycle.
The equipment is expensive. The moulds are extremely expensive. And its for very high volume production. Like Corvettes.
Some of the higher end moulds for RTM are nickle plated FRP.
Strictly speaking any form of production where resin is transferred under pressure or vacuum falls within the general term of RTM.
Here in the UK a small company using 2 piece resin moulds, and inexpensive pumping equipment, successfully makes items such as carbon motorcycle side casings, using the closed mould RTM process, which results in parts which are dimensionally accurate, and require very little final finishing.
For smaller parts there is certainly little need for costly hard tooling, and this means of production would I think work very well indeed for small items, which need a good finish on both sides.
True. But there is a huge difference between pressure driven RTM, and vacuum driven RTM. Cost, volume, consistancy, quality, being the major differences.
Here in the states. RTM refers to the pressure driven type.
Small company here in the UK has had some sucess with pressure RTM using resin tools, and cheap pressure source.
Theres also RTM Lite that several companys have been successful with. Lower pressure and a thinner upper mould.
Seems to me that anyone wanting to spend time perfecting pressure RTM process for smaller parts, using cheap resin moulds and pressure source, would be able to build a pretty profitable business, as very easy to turn out quality parts, quickly and easily, with no need for any of the consumables needed for vaccum process.