I hot coated the bottom of my board last night using a lam resin + wax in styrene + yellow pigment. I set the mix off 1kg / 15ml cat. The hotcoat goes on well and I get a pretty good finish, but then as it starts to gel it starts to, well kinda of sags. Its as if the hotcoat just wants to seperate, especially on the rails. Am I just putting too much on in the first place? I could try a lighter coat, but it doesn’t look as if it will fill the weave (I’m using Volan). It looks like I’m in for an evening of Wet ‘N’ Dry tonight eh? Oh well. Cheers Peaman
Sounds like it wasn’t layed on right.Hotcoating is more like flowing versus painting.I put the hotcoat on pretty thick,next I use cross strokes across the board (I do this twice)by doing this you spread the resin out.Lastly I slowly run from nose to tail with brush starting from the center to the rail on both sides.I hold the brush at an angle with very light pressure…just the weight of the brush so to speak.Normally my hotcoats will kick within 10 to twenty minutes.If it takes longer you are kicking it too slow.As a note I am speaking of Polyester Resin. R.Brucker
I put the hotcoat on just as you’ve described Mr Brucker. But, I’ve been thinking all morning about the problem, and I think I might of dropped on it. The hot coat was on the underneath of the board wrapping around the rail and onto the deck to my lap lines (I taped them off). I basically hoatcoated in a stronger yellow colour upto the lap line to create a really sharp line (lap line) so I could pin stripe over the top to blend into the deck. So, I didn’t have to work upside down, I shot the deck side with a small amount of the hotcoat around the rails, let it kick in, then flipped the board over to do the bottom. I did this and just blended the hotcoat on the rails, it looked really smooth (until it went saggy). I’m now, in hindsight thinking, did the wax rising up from my first coat contaminate the second? so they just slipped off each other? Thanx again for all your help Peaman
…are your racks level? if not ,this will cause separation in coats.Herb
Howzit Peaman, Sounds like to much resin, you could have rebrushed the separation area if the resin hadn’t started setting up yet. I occasionally see resin trying to separate on thick boards that have very full rails. How much resin did you apply? Aloha, Kokua
Thanx guys. I did the next one alot lighter, and it helped. Although I still had a few tiny sags. The rails are very deep, so I guess it’s just gravity that’s making it a little more tricky. I’ll keep practising!! Cheers Peaman
Howzit Peaman, Keep at it, perserverance pays offf in the end. Aloha, Kokua
when people say they are mixing a real thick hotcoat. how do they get it real thick? cabosil? thanks
Howzit Pauluk, If you want to thicken the resin You can take UV and pour it in to a container and just leave it out ( not exposed to UV ray ) some of the strene will evaporate in 2 days. If it’s to thick just add some more resin out of your source to thin it out a little. Then add SA and catalyst add your on your way. I don’t do this except for repairs. Aloha, Kokua
how do i do a thick hotcoat with polyester? i dont use uv. thanks
Howzit Pauluk, Why do you need a thick hotcoat? You’re just going to sand most of it off. I’m a really aggressive sander so as to get the weight down on my boards and I rarely hit the weave. But what you might do is just do a squeegee baste then do a normal hotcoat. It would use a little more resin but you would have a thicker coat of resin to sand. Aloha, Kokua
so just sqeegee the whole bottom of board for example? might get rid of those shadows on the laps? thanks
Howzit Pauluk, Yep just squeegee the bottom then brush coat the laps. During this step I’ve also pulled the tape in the tail edge area so as to add resin to get a hard edge when it’s sanded. Hope this is clear. Aloha, Kokua
so im just basically double hotcoating the bottom? thanks