Sanding/planing resin flat?

M

mark84

New Member

• Sep 17, 2017

• #1

Hi,
I love polyurethane resin, It's brilliant and i'mhaving a great time learning how to use it and seeing what I can create.
One problem I keep coming up against is the back not being flat on a one piece mould, something that should be simple ends up being time consuming and hard to get accurate with sand paper.
Does anyone have solutions, sanders, planers or something?
Any help is wonderful and much appreciated

Mark

 

JBReplicas

Sr Member

• Sep 17, 2017

• #2

Get yourself a flat surface and stick down several sheets of different grade sandpapers, if you sand the parts in a figure 8 working through the grades that should help to get a surface flat, as far as getting it square to another surface you might want to look at how level your mould is when you pour in your resin, a spirit level is a good idea in that regard. another tip if pouring resin into an open, 1 piece mould, once the resin is in and up to the level/top of the mould, get a small strip of styrene and wipe away any excess on the top.

 

comm510

Sr Member

RPF PREMIUM MEMBER

• Sep 17, 2017

• #3

You can also sand the part relatively flat with a DA sander while it's still in the mold

 

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negativ3

New Member

• Sep 17, 2017

• #4

mark84 said:

Hi,
I love polyurethane resin, It's brilliant and i'mhaving a great time learning how to use it and seeing what I can create.
One problem I keep coming up against is the back not being flat on a one piece mould, something that should be simple ends up being time consuming and hard to get accurate with sand paper.
Does anyone have solutions, sanders, planers or something?
Any help is wonderful and much appreciated

Mark

Click to expand...

Glass plate + super77 + sand paper. Works a treat for everything from brass to pla

 

robn1

Master Member

• Sep 17, 2017

• #5

How big a part are we talking about? If it's not too big a mold top can be used to make a flat backed casting. It's just a flat slab of silicone placed over the poured resin. This could sag if it's too big though, I've seen other folks use a piece of glass sprayed with mold release as a topper.

 

M

mark84

New Member

• Sep 24, 2017

• #6

Thanks for all the brilliant ideas