Rings are from the un-reinforced resin that’s floating over the top of the weave. Keeping everything tight in hotcoating, sanding, glossing and finesanding is key Something to think about when glassing. Un-reinforced resin is a common problem with standard glassing methods. Important and often overlooked.
Skil 100 Database HERE
And Gene has entered the building!! Thanks very much, as usual, short and sweet but extremely useful. Muchas gracias
Rules of art specifies that resin must have a higher elongation to break than reinforcement and reinforcement must be in all loaded direction so no resin cracks possible... with flexible top coat no spider but hard to unsandable.
As a measure of how hard you can go with the squeegee, my mentor (I'm no where good enough to do this) did a few boards where he used a steel squeegee vertical to scrape off excess resin, aiming for sub 1:1 resin:cloth loading and very lightweight boards. Did wet out of cloth on glass sheet and transferred to the board, too, to reduce absorption of resin into blank.
As I recall the experiments resulted in light, strong boards but there was too much work in the laminating to do production-wise.
Interesting stuff. I made a few deep coloured boards with FH tints and a few people on here looked at my lamination pics and said I was scraping too hard as the colour was very slighgtly missing just at the top of the weave. I like it scraped as thin as poss mainly because I am a bit OCD and if I see a blob or shiny spot I want to scrape it all so I can see a nice clean field of weave before it cures. Maybe that's fine for clear boards, just for colour work it needs a bit less scraping, maybe.