is it b/c i brushed it into the mold that when i flex the part a bit its cracking?
Its probably too thin…
All I can tell you is that youll think its too thick and its probably still a bit thin.
When I get done spraying it in my molds…it has a hazy look to it, like it will be fogged.
Sometimes I still have the outside edge too thin and it will chip when I trim the part.
I mastered my technique by knowing how much gel it takes to make two parts. I measuer x amount of weight and they get sprayed equally…until I know how much a part takes…its guess work.
your spraying it with what type of equip? how many passes, mils? i heard 1.6mm thicks is pretty good.
I dont measure mills…or passes.
I figure out what the weight of the material is for a certain part and keep spraying it in coats till its gone.
Example
I use cups that hold 200 grams of gel coat…I know if I use all of it on two parts Im good.
I use an hvlp gun to shoot it with a 2.0 tip.
HVLP 2.0 tip thing im going to try next. i have a cup gun. but… afraid i wont be using enough to make it spray out and just waste a lot.
thats why I got rid of my cup gun…I dont make big parts and I can brush on the tooling gel coat for my molds and HVLP the clear for parts
cool beans. thanks!
the only thing i see happening with me is, how do i get into a part of the mold that is upside down =( and get there. if i spray, then brush its going to look off. what do other do to get into tight corners.
I dont get what you mean…
I only brush gelcoat on my plugs…when Im making a mold.
For parts I spray it.
If you have to spray tooling gel…youll need a bigger tip than 2.0…tooling gel seems to be a bit thicker than surfacing gel.
im talking about spraying inside a mold, a clear gel coat. when making a part… i had a thread on this before. to get into certain areas, how do you spray that??
The shape of some moulds mean spraying is impossible. Brushing is in most cases quicker than spraying, but does require practice to get uniform even coverage.
typicaly I find the deepest recess and that is the starting point. Put a light spot on it and them make light passes past it from different angles…waiting a minute between them. Then just coat the rest of the part.
When you do it like that you do the build up of the recess without saturating your mold trying to get to it.
Youll figure it out as you go…but spraying is way easier than brushing into hard to reach areas.