Weld-On #4 vs #42

h2so4hurts

Active Member
View Badges
Joined
Jan 13, 2020
Messages
273
Reaction score
288
Location
Chapel Hill, NC
Nah, I don't necessarily care for the rounded edge look. If #4 is good enough of a bond, then Im fine with that. I don't prefer to spend $200 on an applicator gun for the 40/42 just to have that look.
Don't need the gun for tilt method, just mix it and pour. It's sold in both cartridges and tubs. 4 is like 2500 psi. Glass tanks with silcone are 45. I think you'll be ok :)
 
OP
JustinForMayor

JustinForMayor

Member
View Badges
Joined
Jul 11, 2020
Messages
19
Reaction score
1
Location
Saint Augustine
I shim and clamp. Because the air bubbles set quickly and it's way easier to shim them than fart around with clamps to do it.
You have the pins in the acrylic joints, obviously.. Im still not following on the shims though. From what I've seen, the shims go underneath the tank?
 
OP
JustinForMayor

JustinForMayor

Member
View Badges
Joined
Jul 11, 2020
Messages
19
Reaction score
1
Location
Saint Augustine
Im curious as to how the shims help though? It's a flat surface, so when you clamp down after you pull the pins? Whats the difference whether you have shims there or not? Sorry, I don't mean to seem dumb lol. Im just trying to see how the shims help with air bubbles when the tank is only resting on them.
 
Top Shelf Aquatics

h2so4hurts

Active Member
View Badges
Joined
Jan 13, 2020
Messages
273
Reaction score
288
Location
Chapel Hill, NC
The acrylic has flex. Shimming adds pressure to push the bubbles out. I promise you'll be happy you have the panel shimmed if you get an air bubble in the seam ;). You also do not want to over clamp, just enough to hold it in place. Don't clamp so hard it squeezes everything out of the seam.
 
OP
JustinForMayor

JustinForMayor

Member
View Badges
Joined
Jul 11, 2020
Messages
19
Reaction score
1
Location
Saint Augustine
The acrylic has flex. Shimming adds pressure to push the bubbles out. I promise you'll be happy you have the panel shimmed if you get an air bubble in the seam ;). You also do not want to over clamp, just enough to hold it in place. Don't clamp so hard it squeezes everything out of the seam.
Makes sense. But what is the difference between it sitting on a flat/level surface and clamping rather than sticking shims under there? I promise this is my last question, lol!
 
OP
JustinForMayor

JustinForMayor

Member
View Badges
Joined
Jul 11, 2020
Messages
19
Reaction score
1
Location
Saint Augustine
Again, you can focus the pressure where the bubbles are so you can get them out before they set. Practice. I think you'll see what I mean :) Expect your first seams to be terrible. So plan for those to be in the back of the tank :)
I gotcha..makes sense..so do you shim before you apply the #4 or after you pull the pins and see where the bubbles are? You're right..once I do a couple joints, itll make sense a lot more!
 
OP
JustinForMayor

JustinForMayor

Member
View Badges
Joined
Jul 11, 2020
Messages
19
Reaction score
1
Location
Saint Augustine
Put the bottom panel down. Place shims every 6". Place the top panel and hold it in place with a 90 degree clamp. Pin a gap above the shims. Check that everything is squared up, lay the 4, start pulling the first pin after 4 min, shim the bubbles.
Appreciate the information! Thank you!.. When you built yours, did you do a euro brace or a top?
 
Top Shelf Aquatics

Is your current reef tank the BEST reef aquarium you've ever had?

  • Yes

    Votes: 206 68.7%
  • No

    Votes: 69 23.0%
  • It's a tie

    Votes: 11 3.7%
  • Other (please explain)

    Votes: 14 4.7%

Online statistics

Members online
2,356
Guests online
5,020
Total visitors
7,376
Chemi-pure.com - All-In-One Aquarium Filtration
Top